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correct turbo 400 codes ???

66K views 12 replies 6 participants last post by  leboc974 
#1 ·
ccarney69 said:
1970 Turbo 400's
CA-400 V8 2 barrell carb Chevy and Monte
CB-454 V8 345 hp Chevrolet
CD-400 V8 Chevelle and Monte
CF-400 V8 Chevrolet
CG-454 V8 Police
CK-350 V8 Corvette
CR-454 V8 390 hp Chevrolet
CS-454 V8 Monte Carlo and Corvette
CW-400 V8 Chevelle
CY-454 V8 Chevelle and Corvette
CY-396 V8 Camaro
I got my information from "How to work with and modify the Turbo 400 Transmission" by Ron Sessions.
According to "chevrolet by the numbers" 1970-75 by Alan L. Colvin,
the 1970 turbo 400 numbers look like this.....
A)= 400 (Chevrolet)
B)= 454 (Chevrolet)
D)=400 (Chevelle & Monte Carlo)
F)=402 (Chevelle, Camaro & Nova)
G)=454 (Police)
J)=402 (truck 10-30 series)
K)=350 (Corvette)
R)=454 (Chevelle)
S)=454 (Chevelle, Monte Carlo & Corvette)
W)=402 (Chevelle, Camaro & Nova)
Y*)=454 (Chevelle & Corvette).....(* high shift point).......
________________________________________________

I have 2 other examples, of TH-400 numbers, just as generic as these samples......
..one is 1965-1975......the other one is 1969-1972.......
and this one..http://www.teufert.net/trans/t-400.htm..starts at 1971 ,and ends in 1976.....
__________________________

Here is (4) different examples, I have seen......of what I believe is, the 1970 LS6 Chevelle code......

CY = 454 V8 Chevelle and Corvette...ron sessions
CY = 396 V8 Camaro......................ron sessions

CY*= (Chevelle & Corvette).....(* high shift point)...alan l. colvin

CY = 350, 396, 427, 454 / (245, 255, 425, 450hp)......smittyocat

CY*= 454ci 450hp (Chevelle) ,
........427ci 425hp (Chevrolet) ,
........427ci 430hp (Corvette) ,
........427ci 435hp (Corvette) ,
........396ci 375hp (Chevelle, Nova, Camaro) ,(High Shift Point)..chevellestuff.com/1969 POP decoding..
_________________________

I realize it's hard to get information correct, without visually inspecting, either the number matching car, the original buildsheet or the original protect-o-plate......

I have done, just that on these (5) examples of 1970 Super Sport cars....with th-400 transmissions..
I am pretty certain these are correct, because I used several different examples to extract the information, although the code could have been re-used in other Chevrolet models...in different years...and applications...

(CF) = L34 Chevelle SS396 (350hp)
(CR) = LS5 Monte Carlo SS454 (360hp)
(CS) = LS5 Chevelle SS454 (360hp)
(CW)= L78 Chevelle SS396 (375hp)
(CY) = LS6 Chevelle SS454 (450hp)

Can anyone dispute these (5), 1970 Super Sport transmission useage codes as being, wrong ???

I am sure with all the big block cars built in 1970, some of these transmission codes could have been re-used in Impala's, Camaro's, Corvette's, Nova's, ect......................

I guess my point is, when these $29.95 books are wrong, some of the (free) information on the web
"IS PROBABLY" going to be wrong, also......just, because someone used the inaccurate book as their reference materials..and I am as guilty, as the next guy....I usually, use all 5 of these sources to get my transmission decoding info, and will continue to use them all, with a grain of salt...............Don.
 
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#2 ·
1969-1975 Chevrolet Turbo 400 Identification Codes......

transmission code)- engine size....(horsepower)....Chevrolet factory useage.......

CA)- 350,396,400,402...(145,160,170,240,255,265hp)... 2bbl, Chevrolet, Monte Carlo...
CB)-400,427,454...........(180,345,390hp)....Chevrolet...
CC)-396......................(325hp)........Chevelle, Camaro...
CD)-327,350,400,402,454.....(215,235,240,250hp)...Chevrolet, Chevelle, Monte Carlo...
CE)-396.......................(350hp)...Chevelle, Camaro, Nova...
CF)-402,427,454...........(215,235,270,335,350hp)...Chevrolet, Chevelle, Monte Carlo...
CG)-396,454................(265,365,390hp)...Chevrolet, police...
CH)-427......................(390hp)...Chevrolet...
CJ)-396,402.................(xxx,240hp)...Chevy Truck 10,20,30 series...
CK)-350......................(165,190,195,200,300hp)...Corvette...
CL)-427.......................(400hp)...Corvette...
CP)-xxx.......................(xxxhp)...Chevy Truck C-30 series...(no info)...
CQ)-427......................(335hp)...Chevrolet...
CR)-400,402,454..........(170,215,235,240,270,360,390hp)...Chevrolet, Monte Carlo, Chevelle, police...
CS)-454......................(245,270,360,365hp)...Corvette, Chevelle, Monte Carlo...
CT)-xxx.......................(xxxhp)...Chevy Truck C10 & C20 series...(no info)...
CW)-402.....................(375hp)...Chevelle, Camaro, Nova...
CX)-396,427................(375,425,430,435hp)...COPO...
CY*)-350,396,427,454...(245,375,425,430,435,450hp)...Chevrolet, Corvette, Chevelle, Camaro, Nova..
......... *high shift point...
CZ)-350......................(205,250,255hp)...Corvette...
_____________________________________________

These numbers/codes were compiled from at least (5) different sources.........
I doubt, they are complete, or, completely accurate, but, they will probably beat nothing if you are trying to decode late 60's-early 70's Chevrolet turbo 400 transmissions........Don.
 
#8 · (Edited)
September 17,2006 update.........
1965-1975 Chevrolet Turbo 400 Identification Codes......
Chevrolet)
transmission)
codes)-- engine sizes....(horsepower).....Chevrolet factory useage.......

CA)- 350,396,400,402...(145hp--325hp)...Chevrolet, Monte Carlo...
CB)-396,400,427,454....(180hp-345hp-390hp)....Chevrolet...police...
CC)-327,396................(xxxhp-325hp)........Chevelle, Camaro...police...
CD)-327,350,400,402,454...(215hp--330hp)...Chevrolet, Chevelle, Monte Carlo...
CE)-396......................(350hp)...Chevelle, Camaro, Nova...
CF)-402,427,454..........(215hp-335hp-350hp)...Chevrolet, Chevelle, Monte Carlo...
CG)-396,454................(265hp--390hp)...Chevrolet, police...
CH)-396,427................(390hp)...Chevrolet...
CJ)-396,402.................(xxxhp--240hp)...Chevy Truck 10,20,30 series...
CK)-350......................(165hp--300hp)...Corvette...
CL)-427......................(400hp)...Corvette...
CM)-307.....................(xxxhp)...Chevrolet...
CP)-xxx......................(xxxhp)...Chevy Truck C-30 series...(no info)...
CQ)-427.....................(335hp)...Chevrolet...
CR)-400,402,454.........(170hp--390hp)...Chevrolet, Monte Carlo, Chevelle, police...
CS)-454......................(245hp-360hp-365hp)...Corvette, Chevelle, Monte Carlo...
CT)-xxx.......................(xxxhp)...Chevy Truck C10 & C20 series...(no info)...
CW)-402.....................(375hp)...Chevelle, Camaro, Nova...
CX*)-396,427..............(375hp-425hp-430hp-435hp)...COPO...
......Chevrolet, Chevelle, Camaro, Corvette, Nova........... *high shift point...
CY*)-350,396,427,454...(245hp-375hp-425hp-430hp-435hp-450hp)...
......Chevrolet, Corvette, Chevelle, Camaro, Nova........... *high shift point...
CZ)-350......................(205hp--255hp)...Corvette...
_____________________________________________

The above numbers/codes were compiled from at least (6) different sources.........
I doubt, they are complete, or, completely accurate, but, they will probably beat nothing if you are trying to decode 1965--1975 Chevrolet turbo 400 transmissions..
________________________________________________
(6) "known" examples of 1970 big block, A-bodied cars..th-400 transmission codes..
..taken from several original examples, of 1970 Chevelle / Monte Carlo buildsheets..
(CD) = LS3 Chevelle 400 (330hp)
(CF) = L34 Chevelle SS396 (350hp)
(CR) = LS5 Monte Carlo SS454 (360hp)
(CS) = LS5 Chevelle SS454 (360hp)
(CW)= L78 Chevelle SS396 (375hp)
(CY) = LS6 Chevelle SS454 (450hp)......................................Don.
I "simplified" this chart, by using..the smallest & largest known factory horsepower rating..
and, I also added....[5 years]....from....(Chevrolet by the numbers 1965-1969).....Don.
 
#7 ·
Billy,
The only [CD] example I have seen, was a 1967 passenger car w/327 & th400..........
I don't remember if it was a Caprice, Impala, Biscayne...................
Julian date code [308] = Saturday, November 4, 1967............CD-68 = 1968 model.......
93628 = probably the transmission serial number.......................Don.
 
#9 · (Edited)
Miscellaneous "1970 Chevelle"/Chevrolet decode information ............

1970 Chevelle "production numbers" ....
The info I have, on 1970 Chevelle SS 396's numbers say,
RPO Z25 (SS396) coupes, convertibles, & El Caminos ---- = 53,599 total built..
RPO L34 (350hp) 396 V-8 ----- = 51,437 ...
RPO L78 (375hp) 396 V-8 ------ = 2,144 ...
RPO L89 (L78 w/aluminum heads) -- = 18 ...
__________________________________
1970 Chevelle SS 454's numbers,
RPO Z15 (SS454) coupes, convertibles, & El Caminos ---- = 8,773 total built..
RPO LS6 (450hp) 454 V-8 ----- = 4,475...
RPO LS5 (360hp) 454 V-8 ----- = 4,298...
____________________________________
Total # 1970 Chevelle Super Sports, all engines, coupes, convertibles, & El Caminos -- = 62,372
1970 Tonawanda production records for 402/350HP on L-34 Chevelle- Camaro- Nova:
*28,414 engines produced w/Man.Trans coded CTX.
*31,004 engines produced w/Auto. Trans. coded CTW.
----------
= 59,418 Total engines produced

Add to that..

*51,437 1970 Chevelle/Elco L-34 Super Sports made.
*1,864 1970 Nova L-34 Super Sports made.
*1,802 1970 Camaro L-34 Super Sports made.
----------
= 55,103 Total cars made.

Take total cars made from total engines produced, = 4,315 engines left over for Service Useage.
The figures I got from Fran Preve, the Tonawanda Plant Historian are: 8,121 LS-5 360HP Engines, which does include Monte SS454.

The Chevelle figures as recorded by Tonawanda are 2,763 (Man Trans) and 2,197 (AT) for a total of 4,960. Of these 662 were made as service engines, leaving total Chevelle LS-5 car production as 4,298.

I do not have the service engine breakdown for Monte Carlo, so I cannot give you an exact figure, but subtracting the 4,960 from the 8,121 gives a maximum of 3,161. I may have some info on LS-5 optioned Vettes and if so, will post tomorrow. Keep in mind, many more blocks were made in the 1970 year for service useage including service for 69 and earlier 427 applications. Those service engines made in 1970 will use the #512 block, so an exact figure will be impossible to document.

Jeff Dotterer
Former NCOA Senior Judge
1970 Chevelle 'monthly ending' VIN numbers ..............


Here's a list of 1970 Chevelle monthly ending VIN's by assembly plant .... Rick
_________________________________________________________
Earliest documented, 1970 LS6 /and/ LS5 Chevelle Super Sports ............
http://www.chevelles.com/forums/showthread.php?t=122619
[ Originally Posted by mr ]

_________________________________________________________________
1970--------TRIM----BUILD-----ENGINE------POSTEDBY-----DATEPOSTED--
CHEVELLE----TAG----SHEET-----CODE-------USERNAME-------ON THIS-----
FACTORY----DATE----DATE-----option-----Team Chevelle-----WEBSITE----
__________________________________________________ _______________
Baltimore----12B---12/09/1969----LS6--------greg2001-------08/30/2005
Leeds/KC----12B---12/11/1969---LS6----------RixLS6---------04/10/2006
Van Nuys----12C---12/15/1969---LS6-----------mr70---------04/11/2006
Atlanta------12C---12/15/1969---LS6-------Dave Birdwell-----03/19/2006
Arlington----01A---(---------)----LS5----------LevonH---------02/12/2006
Oshawa-----01B--01/12/1970----LS5-----------RC70----------11/18/2004
Flint--------03B---(---------)----LS6------(F/S/on e-bay)-----03/31/2006
_____
So far..... earliest known Z15 built, LS6 hardtops........

(#1).. 1st known and documented 1970 Chevelle SS/ LS6 was built at Baltimore, Tuesday Dec.09,1969.

(#2).. 2nd earliest documented...LS6/was built at Leeds/KC...Thursday Dec.11,1969 .....

So far..... earliest known 1970 Z15 built, LS5 hardtops........

(#1).. 1st known and documented 1970 Chevelle SS/ LS5 was built at Leeds/KC Monday Dec.15,1969 .....

.. The earliest known 1970 Z15 built, convertibles ..... so far .......

(#1) The 1st documented 1970 Z15 Chevelle SS/ LS6 convertible, so far, was built Tuesday Dec.16,1969 at Baltimore ........

(#1) The 1st documented 1970 Z15 Chevelle SS/ LS5 convertible, so far, was built Wed. Dec.17,1969 at Van Nuys ..........

(#4,475) Last known built Z15 Chevelle SS / LS6, so far, was built [07C] at Leeds/KC. Monday July 20,1970 ......
http://www.chevelles.com/forums/showthread.php?t=142058
This is a quote from Rick Peters from the archives.

I have collected quite a bit of Literature on this subject.
All the U.S. and Canadian dealer price books continuely say that this option was only available early in producton for the 1970 Chevelle and Elcamino.
October 30th 1969 is one letter from Chevrolet to Dealers stating:"The L-78 opition IS IN PROCESS of being cancelled".

Novenber 7th 1969 is a Charleston Zone letter stating:"The L-78 option IS BEING CANCELLED in view of the newly released 454 CID engines".

And finally a November 20th 1969 Product Bulletin stating:"With the release of SS 454 engines,Option Z-25/L-78 375HP 396 V8, and Option Z-25/L-78/L-89 375HP 396 V8 with Aluminum cylinder heads ARE NOW BEING CANCELLED.

This Does not pertain to Novas and Camaros which could have this option After Jan.1970 of course.
__________________________________________________

1970 Chevelle engine codes .........

http://www.yearone.com/updatedsinglepages/Id_info/gm_engine_id/gmidimages/chevelle70.jpg

http://www.yearone.com/updatedsinglepages/Id_info/gm_engine_id/engineinfo6.html

Optional Chevrolet engines, up to the 1971 model year, here's how GM lists them:

[ Originally Posted by Dale McIntosh ]

L22 L-6 Engine - 250 Cu. Inch.
L26 L-6 Engine - 230 Cu. In.
L30 V-8 Engine - 327 Cu. In.
L34 V-8 Engine - 396 Cu. In. Hi-Perf.
L35 V-8 Engine - 396 Cu. In.
L36 V-8 Engine - 427 Cu. In. Hi-Perf.
L46 V-8 Engine - 350 Cu. In.
L48 V-8 Engine - 350 Cu. In.
L62 P-6 Engine - Hi-Perf.
L63 P-6 Engine - Spec. Hi-Perf.
L65 V-8 Engine - 350 Cu. In. (2 Bbl. carb.)
L66 V-8 Engine - 396 Cu. In. (2 Bbl. Carb.)
L68 V-8 Engine - 427 Cu. In. - Hi-Perf. - Tri Carb.
L71 V-8 Engine - 427 Cu. In. - Spec. Hi-Perf. - Tri Carb.
L72 V-8 Engine - 427 Cu. In. - Spec. Hi-Perf.
L73 V-8 Engine - 396 Cu. In. - Spec. Hi-Perf.
L78 V-8 Engine - 396 Cu. In. - Spec. Hi-Perf.
L79 V-8 Engine - 327 Cu. IN. - LD - Spec. Hi-Perf. (Hyd. Lifters)
L85 L-6 Engine - 250 Cu. In. (4 Bbl Carburetor)
L87 P-6 Turbo Charged Engine
L88 V-8 Engine - 427 Cu. In. Heavy Duty
L89 Aluminum Cylinder Heads
LF7 V-8 Engine - 327 Cu. In. (2 Bbl Carb.) (Reg. Fuel)
LM1 V-8 Engine - 350 Cu. In. (4 Bbl Carb.) (Reg. Fuel)
LS1 V-8 Engine - 427 Cu. In. (4 Bbl Carb.) (Reg. Fuel)
LS3 V-8 Engine 400 Cu. In. 4 Bbl. Carb.
LS4 V-8 Engine 454 Cu. In. 4 Bbl. Carb.
LS5 V-8 Engine 454 Cu. In. 4 Bbl. Carb. Hi-Perf.
LS6 V-8 Engine 454 Cu. In. 4 Bbl. Carb. Spec. Hi-Perf.
LS7 V-8 Engine 454 Cu. In. 4 Bbl. Carb. Heavy Duty
LT1 V-8 Engine 350 Cu. In. Special High Performance

"But remember that some of the options codes, were reused in later years"...
______________________________________________

1970 Chevelle Super Sport .... turbo-400 transmissions codes .. found on 1970 model buildsheets ....

(CF) = L34 Chevelle SS396 (350hp)
(CR) = LS5 Monte Carlo SS454 (360hp)
(CS) = LS5 Chevelle SS454 (360hp)
(CW)= L78 Chevelle SS396 (375hp)
(CY) = LS6 Chevelle SS454 (450hp)
______________________________

According to "Chevrolet by the numbers" 1970-75 by Alan L. Colvin,
'these are all, the 1970 turbo 400 codes listed' .....
(CA)= 400 (Chevrolet)
(CB)= 454 (Chevrolet)
(CD)=400 (Chevelle & Monte Carlo)
(CF)=402 (Chevelle, Camaro & Nova)
(CG)=454 (Police)
(CJ)=402 (truck 10-30 series)
(CK)=350 (Corvette)
(CR)=454 (Chevelle)
(CS)=454 (Chevelle, Monte Carlo & Corvette)
(CW)=402 (Chevelle, Camaro & Nova)
(CY*)=454 (Chevelle & Corvette) ..... (* high shift point) .......
________________________________________________

1963 - 1974 Muncie M20/M21/M22 4 speed numbers information, ect...
Muncie case casting numbers, relating production years and ratios available ...
http://www.muncie4speed.com/
[ Originally Posted by Rodeo73 ]


Casting: 3831704 Years: 1963 Only Ratios: M20 2.56 1st , M21 2.20 1st
Casting: 3851325 Years: 1964 - 1965 Ratios: M20 2.56 1st , M21 2.20 1st
Casting: 3885010 Years: 1965 - 1967 Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st
Casting: 3925660 Years: 1968 - 1970 Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st
Casting: 3925661 Years: 1970 - 1974 Ratios: M20 2.52 1st , M21 2.20 1st, M22 2.20 1st

Ratios of the M20 , M21 , M22

Year 1963-1965 Type: M20 Rings: None Ratio: 2.56 / 1.91 / 1.48 / 1.00 / 3.16
Year 1966-1974 Type: M20 Rings: Two Ratio: 2.52 / 1.88 / 1.46 / 1.00 / 3.11
Year 1963-1974 Type: M21 Rings: One Ratio: 2.20 / 1.64 / 1.28 / 1.00 / 2.27
Year 1967-1974 Type: M22 Rings: None Ratio: 2.20 / 1.64 / 1.28 / 1.00 / 2.27

Input Shaft Tooth and Spline Count Related to Year

Year 1963-1965 Type: M20 Rings: None Spline: 10 Tooth Count: 24
Year 1966-1970 Type: M20 Rings: Two Spline: 10 Tooth Count: 21
Year 1970-1974 Type: M20 Rings: Two Spline: 26 Tooth Count: 21
Year 1963-1970 Type: M21 Rings: One Spline: 10 Tooth Count: 26
Year 1970-1974 Type: M21 Rings: One Spline: 26 Tooth Count: 26
Year 1967-1970 Type: M22 Rings: None Spline: 10 Tooth Count: 26
Year 1969-1974 Type: M22 Rings: None Spline: 26 Tooth Count: 26
______________________________________________________________

1970 Chevelle SS '12 bolt rearend codes' ...

[ Originally Posted by mr70 ]


L-34 [SS396/350hp]
(CW) - 3:31
(CF) - 3:31 Posi

L-78 [SS396/375hp]
(CKJ) - 3:55
(CKF) - 3:55 Posi
(CKK) - 4:10 Posi

LS-5 [SS454/360hp] -and- LS-6 [SS454/450hp]
(CRU) - 3:31
(CRV) - 3:31 Posi
(CRW) - 4:10 Posi
_______________

12 bolt 'car' Posi-traction carrier numbers ...........

[ Originally Posted by big gear head ]


Casting ID numbers on the "12 Bolt Posi Carrier" .........
(ED-32088) for the 2 series,
(EDB-30140) for the 3 series,
(EDB-30174) for the 4 series.
_______________________

1964-1972 Chevelle rearend casting numbers .........

[ Originally Posted by David_Bates ]


Chevelle "housing casting numbers", I have personally observed over the decades:

12-Bolt Housing: Casting #
1965 Chevelle (3859140N)
1966 Chevelle (3875745N)
1967 Chevelle (3894939NF)
1967 Chevelle-Late (3917124NF)
1968-Early 69 Chevelle (3917124NF)
1969 Chevelle (3959038NF)
1970-72 Chevelle (3969278NF)

10-Bolt Housing: Casting #
1964 Chevelle (3839390N)
1965 Chevelle (3959139N)
1966 Chevelle (3875744N)
1967 Chevelle (3894938NF)
1968 Chevelle (3917123NF)
1969 Chevelle (3859037NF)
1970-72 Chevelle (3969277NF)
________________________

1970 Chevelle radiator codes ..........

[ Originally Posted by mr70 ]


For 1970,the standard Radiator for those three applications was the 3 row radiator, as well as the L-78 engined Chevelle.Transmission type did not dictate it.

When Air Conditioning was ordered on the L-34, or a 4:10 Rearend was equipped on the LS-5, LS-6, then they would receive the 4 row HD radiator automatically. But when the L-78 came equipped with a 4:10 rearend, it still was built with the Standard 3 row radiator.

1970 Chevelle STANDARD radiator suffix tag codes:
*L-34 Manual- (BE)
*L-34 TH400- (BK)
*L-78 Manual- (BO)
*L-78 TH400- (BJ)
*LS-5 & LS-6 Manual- (BQ)
*LS-5 & LS-6 TH400- (BR)

1970 Chevelle A/C & HEAVY DUTY Radiator Suffix Codes:
*L-34, L-78 & LS-5, LS-6 Manual- (PA)
*L-34, L-78 & LS-5, LS-6 TH400- (PD)
_________________________________

1970 Chevelle dealer zone and dealer name/and/number ........
http://www.chevelles.com/forums/showthread.php?t=27210
[ Originally posted by Dale McIntosh ]

__________________________________________________
 
#10 ·
I know. I have found that in the 65-69 book, some of the fullsize engine codes are not listed, including some of the common ones. My father found some stuff that needed to be updated based on his research such as 409 engine block use and water pump stuff. It's too bad you can't write to the author. I don't think he;s going to come out with anymore revised editions. It is a great book though. I just wrote in the stuff that was missing so its there when I need to reference it.

Warren
 
#11 · (Edited)
More miscellaneous "1970 Chevelle" decode information ............
The #3955291 AB Crank Pulley is the correct deep groove part for a 1969-1970 SHP Big Block.
It was used on 396/375hp and COPO 427/425hp as well as 1970 396/375hp and 454/450hp Big Block applications.

The #3955290 AD is the 2 row Big Block crank pulley that was used on most Big Block standard performance engines except cars w/air conditioning.

The #3976060 AP fan pulley is the 1970 SHP version used on 396/375hp and 454/450hp cars.

The #3947824 BV and DV (both identical except for the code) are correct for the 69 396/375hp and COPO 427/425hp engines. This pulley is the same diameter and offset as the #3976060 AP pulley with the exception of the #3947824 pulley having an internal reinforcement cup that's spot welded to the pulley.

BTW I've seen the #3947824 pulley on 1970 Z28's as well so it seems that it got some usage on some small block LT-1 engines in 1970. I've also seen the #3976060 pulley on 1970 Z-28's as well.
My '69 has the 3955291AB and 3947824BV pulleys and they are both original, deep groove.
The CRQ engine code sticker on a 1970 LS-5, should be mounted on the passenger side rear of the valve cover, facing the firewall. Tonawanda did this, on the assembly line.
1970 Chevelle tach .......
Here's a NOS 5500 tach, notice the last 3 numbers are 985. [The buildsheet will have 985 in box 72]

Both 1970 SS454 Chevelle's and SS454 Monte Carlo's equipped with the LS5 engine, if box 72 on the build sheet has the #938 code, then that car came, with the 5000 RPM tach.

If the build sheet has 938 in [box 72], then it would have a, 5000 rpm tach.
If the build sheet has 985 in [box 72], then it would have the "LS-5" 5500 rpm tach.
If the build sheet has 983 in [box 72], then it would have the "LS-6" 6500 rpm tach.

You would need a build sheet to verify which tach originally came in the car.
Both tachs #938 and #985 were possible for the "1970 LS5 Chevelle".
I have documented proof of that and it has been verified in previous posts on this topic.
Chevelle protect-o-plate codes..........
The P-O-P will give you:
VIN number
Engine number (plant/date/suffix code)
Trans number (type & plant/model year/date)
Rear axle number (ratio/date)
Carburetor source
Options (ps/radio type/ac/etc.)
Build Month

If it is a TH-350, the 2nd line of the P-O-P, 2nd group of alphanumerics would be something like B1H15 for a Cleveland TH-350 (B), 1971 (1), H15 (June 15).

If a TH-400, it should read something like 71D372 for 71 (1971), D (350 engine), 372 for 372nd day counted from January 1, 1970 being January 7, 1971 (if I counted right).
P-O-P "codes" are some options depending on their 'exact' position on the plate.
There are 7 posible code positions beginning directly under the rear axle code. Positions are:
1) - 1 is power steering
2) - 1 is power brakes
3) - 3 is radio [type not specified on POP, just to be equipped with a radio]
4) - 3 disk brakes
5) - 1 is 4 season air conditioning and 3 is 'comfotron' air conditioning
6) - 3 is power windows
7) - 3 is power seats

Would the sequence be "1[space]331" or "[space]1331" ?

1970 Chevelle wheels/tires/rotors .........
A vendor catalog I have, lists the 'YA' wheel #3956744 as correct until 10/69, or an Oct. 1970 car.
And the 'AO' #3975651 as correct, for cars built after 10/1969.

It also list a 1st & 2nd designs for the snap in center cap for the YA wheel and a 1st & 2nd design for the snap in center cap for the AO wheel.
If I'm reading your first post currectly where you give all the code info, if the wheels have a date of M 1 to the left of the valve stem and in the center of the wheel, 9 this is the Manufacturer, assembly plant and year of manufacture info.
M= Motor Wheel
1= Romulus MI.
9= 1969
The other info you received is correct, 8 = August and 25 = the day.

I personally have seen and owned 1970 Chevelles and El Caminos with this YA code for the wheel usage on their buildsheets.
Every 1970 that I have owned with YA coded wheels was a 396/375 L78 model, which are early production vehicles.
In 1970 there were 5 tire brands possibly used, at plants discretion.
F70X14:
*Goodyear Polyglass, as stated no GT rating.
*Firestone Wide Oval.
*Uniroyal Tigerpaws.
*General 700.
*and some say Goodrich, although I have personally never seen it, but would like to.
O.K. heres the info i got on Goodyears for 1970

begining of production up to OCT. 31 1969
F70X14 114-482-498 Custom Wide Tread 2/2 Polyglas (NS )*RWL
NS stands for no size on side wall

NOV. 1 1969 thru DEC. 31 1969
F70X14 114-482-498 Custom Wide Tread 2/2 Polyglas (NS )*RWL
OR
F70X14 114-482-235 Custom Wide Tread 2/2 Polyglas RWL (this one has the size on the side wall)

JAN. 1 1970 ON UP
F70X14 114-482-235 Custom Wide Tread 2/2 Polyglas RWL (this one has the size on the side wall)
Buildsheet for my 1970 El Camino shows G70 14, so it helps to have the build sheet.
I believe on all SS El Caminos,
Who ever was the low bidder on tires that month or whatever correct tire was available ...... Thats what you got !!!!!
Like I said my Camino was delivered to me in April of 1970.
I ordered this SS454/M22 and it had "B.F.Goodrich Silvertowns" with a white stripe.
I also have a picture of my Camino from the fall 1970 w/white stripe tires!!

1970 2-piece rotors do not have a groove cut in to them, but the 1-piece design does have a center groove cut into the brake surface. 1-piece rotors are also date coded and part #d like rear drums. I've seen 1-piece rotors on cars built as early as Jan, I believe Jeff Dotterer has a LS5 built in Baltimore during this time frame whereas my own LS6 convert has 2-piece rotors and it was also Baltimore built but in Feb. of 1970.
Your buildsheet has codes on the upper left hand corner with spindle codes that call out for which type your car would have used. I should clarify that 1-piece rotors are primarily what's used on cars built after February 1970, but like almost everything with these cars, there are exeptions.
..... 1970 speedometer gear adapter/reducer .........
Rick Nelson is correct about the adapter # being 666F. The ratio of reduction is the .8241 # as I understand it for what that's worth. Many of the adapters I've seen are stamped like this, 666F A1
.8241C
Interestingly info from both survivor cars and buildsheets from 1970 454 Chevelles show the same gear ratio adapter used on both T.H. 400 cars and M22 cars. I beleve the 666F # to be a unit I.D. and the A1 to be the date code of the unit and .8241 to be the reduction factor . The letter C shows up on buildsheets along with driven gear info.
We have 666F N11 8241 on Bob's car. Unsure of how to decode as well.

I inquired about the reducer before and got some good answers on www.yenko.net.

1970 Chevelle windshield wipers/glass ..........
I'm pretty sure 69's are the same as 1970's and if so, they came with either Anco or Trico blades depending on assembly plant source etc. Ancos were a flat silver finish while the Tricos were the brushed finish everyone here is talking about.
If you want to get real crazy we can discuss what style refills they originally came with, i.e. how many ribs are on the side of the rubber!
"I have seen more Trico blades for reference, than Anco blades but here goes". The blades on 1970 Chevelles that I have had, have 3 horizontal ribs that follow the sides of the blade. Later sometime in the 1970's they changed to 2 ribs along the side then no ribs at all like on current Trico replacements. I have some NOS blades in 69 dated boxes with the 3 rib design and one with a price tag date 3-2-72 for $2.17.
I have restored quite a few 1970-72 Chevelles, both coupes and convertibles, and they use the exact same wiper arms and blades. I know the blade lengths are 16" on both and the part #s for the arms are the same for coupes and converts. 3913613 L.H. and 3913612 R.H. These #s are for Malibu Sport Coupes and Convertibles with depressed park. These include Super Sport models.
According to GM Restoration Kit information:
1968 - Hide-A-Way windshield wipers standard on SS396, Concours and Malibu models - optional on others.
1969 - Concealed Windshield Wipers with Articulated Left Blade - std on Malibu, Concours, Custom El Camino.
1970 - Concealed Windshield Wipers with Articulated Left Blade - std on Malibu, Concours, SS Option. Can't say about, 1971 and 1972.
Articulated left blade means the left (driver side) wiper arm had the smaller arm that attached to a pin and made the actual blade itself pivot more.
I guess this was done for sizing limitations in the windshield. I know 1970 El Camino SS 396 has the concealed wipers [RPO code C24] with the articulated left arm.
LOF - Libby, Owen, Ford codes are two letters, like [ NT ] where N = January and T = 1970.

Month codes: N=January, X=February, L=March, G=April, J=May, I=June, U=July, T=August, A=September, Y=October, C=November, V=December

Year codes: G=1964,1977; J=1965,1978; A=1966,1979; Z=1967,1980; X=1968,1981; V=1969,1982;
T=1970,1983; N=1971,1984; Y=1959,1972, U=1960,1973; L=1961,1974; I=1962,1975; C=1963,1976
The above is for LOF glass.

PPG glass is dated differently. In 1966 the codes were a 1 or 2 digit month followed by a single digit year. Example; 85 = August 1965 It appears that PPG later switched to a julian date (day of the year) followed by a single digit for the year. Example would be 2579 for the 257th day of 1969. A reply to one of my posts by Shawn shows examples of this.

Edit: I have since learned that [PPG glass] the first two digits are a plant code followed by month of the year and the last digit is the year. So 2579 would be plant 25, 7th month (July), and 1969.
I just finished doing some research on this as well.
L-O-F seems to be the major manufacturer of glass for the "Chevelle".
Safety-plate means original ......
Safety-float means replacement ......
I had a survivor SS that had PPG side glass only. I got a hold of the original owner and he said that he did have that window replaced in 1977 with PPG glass. PPG to my understanding is replacement also, not factory. LOF did all the glass around the car. This is from what I have found.
Rick Peters .... 1970 Red/Red Chevelle SS .... L-78/M-40/4:10 Restored ...
1970 Chevelle master cylinder/brake booster .......
1970 Chevelles with disc brakes got a # 5470409 cast master cylinder. This casting had many uses so you also need to look at the front of the cylinder below the lid bail wire at a machined half moon pad. This needs to have a BB suffix code along with a julian date stamped on it.

Your booster is a Delco Moraine unit that will have a part # 9391 and a julian date stamped on the top tab of the back half of the booster.
CN is the code GM used for the whole disc brake booster -master cylinder assembly.
Therefore you won't find a CN coded master. All 70 disc brake Chevrolet A-body masters are coded BB.
This along with the 9391 part # brake booster received the CN cardboard tag mounted to the booster check valve and a CN coded sticker attached to the master cylinder bail wire that keeps the lid on the master.
1970 Chevelle smog pumps .....
All solid lifter equipped Chevrolets built in 1970 got the A.I.R. smog system. Didn't matter if the car was an automatic or manual transmission, if it was a "Special High Performance" solid lifter car i.e. LS6, L78, LT1, etc. it had smog.
Regarding buildsheets, box 41 denotes air pulley and depending on plant built at will include information for that part. Box 36 or Box 37 will have the fan belt code that identifies the smog pump application as well.
1970 f-41 front sway bar ...........
It's been my observation that all the [1-1/8"] assembly line front sway bars for 1970 had the "squared end" on the passenger side and a "round end" on the drivers.
I have 2 NOS over the GM parts counter bars part # 402544 that are round on both ends. I have had many of these replacement GM bars over the years but I have never seen one on an original car, so I don't think that they were used this way on the assembly line.
I've seen the single square end style on 1971 & 1972 Super Sports as well so I always assumed the double round style to be a later replacement style.
1970 Chevelle Alternator codes .....
For Chevelles...
Distributors and alternators - anything else Chevellestuff > Links > Quick Decoding. :thumbsup:
The alternators are the Base units & Hi-output units......

#1100834 stamped CW for Hydraulic lifter engines are:
L-34 402/350HP
LS-5 454/360HP

#1100837 stamped CZ for Solid Lifter engines are:
L-78 402/375HP
LS-6 454/450HP
1100834= Base 37Amp Hydraulic lifter application.
1100843= Optional 61 AMP Hyrdraulic lifter application. (usually included with A/C)
1100837= Std.37 AMP SOLID Lifter Spl. Hi-Horse application. (Deep Groove Pulley)

Regular Production Option K-76, was a #843 61 AMP Alternator, possible on US built & Canadian built Chevelles, when a higher output Alternator was desired over the Base 37 AMP Alternator, when Air Conditioning was not desired.
Not to be confused with another RPO, K-85 63 AMP Alternator.
 
#12 · (Edited)
More miscellaneous "1970 Chevelle" decode information ............
It's the regular production option code that told the body shop and the trim shop the car was to have the SS396 conversion done, i.e., external trim, bumper pad, badging, interior trim, etc. RPO code Z25 is the code for the 'Basic SS 396 Sport Package' but only KC put that code on the build sheet; ZL3 is the SS396 conversion code and Z15 is the code for the SS454 PKG. Only the Kansas City SS396 cars got both the ZL3 and Z25 codes, all other plants only used the ZL3 code for the SS396. The SS454 only got the Z15 code on the sheet.

On the 1970 SS396 cars, I have build sheets on:

Arlington ~ ZL3 SS 396 CONV
Atlanta ~ ZL3 SS 396 CONVERSN
Baltimore ~ ZL3 SS396 CONVERS
Kansas City ~ ZL3 SS CONV plus Z25 SS 396 PKG
Van Nuys ~ ZL3 SS 396 CONVERSN
Here's some info for an May 1995 issue of Super Chevy Magazine. The rarity of 1970 models.

RPO/Description/Quanity
AQ2 Electric Seat Back Release 663
AS4 Rear seat shoulder harness deluxe 273
A41 Front seat electric control 4-way 637
A42 Drivers bucket seat electric control 4-way 546
A90 Electric trunk release 987
CD3 Electro-Tip W/S wiper control 331
K30 Cruise control 730
LS6 454/460hp 4475
L78 396/375hp 2144
L89 Aluminum heads 18
M22 HD 4-speed trans
MK1 Cushion grip steering wheel 3078
UM2 AM/FM stereo tape 4532
Z15 SS454 Equipment 8773
Z25 SS396 Equipment 53599
Where can I find out the production figures, for the 1970 SS Chevelle convertible?
This question is asked often in one variation or another. The only production numbers available are the total number of 1970 convertibles which was 7,522 and 62,372 SS (coupes + conv.) according to the info I have. No one knows how many convertible were SS cars. The best you can do is guesstimate using statistics. Less than 2% of '70 Chevelles were convertibles and about 14% of '70 Chevelles were "SS" so a logical guess would be 1,078 SS convertibles were built in 1970. Taking the statistics a bit further one could guess approximately:

889 396 L34 convertibles
37 396 L78 (5 is oftened quoted)
1 396 L89 mathematically its 1/3 of a car
74 454 LS5
77 454 LS6 (19 is often quoted)
---------
1,078 Total SS convertibles

Chances are there were fewer LS6 and L78 convertibles than derived statistcally because most buyers would not specify a high performance engine in a convertible.
my $0.02 I'd be interested as well if anyone has better "guesses".
Yes there were 7,522 convertibles built, but only 7,141 could be SS models (requ'd V8). Here's my statistical extrapolation:

Model................Tot prod.....SS..
Malibu 2 dr, V-8......289,622...53,525
Malibu conv., V-8.......7,141....1,320
Custom El Camino, V8...40,728....6,207

As far as engine combinations in convertibles go (assuming my 1,320 estimate of the number of SS convertibles):
L34...1,088.57
L78......45.37
L89.........38 (very remote probability)
LS5......90.96
LS6......94.71
Total 1,319.99

Also, since the L78/L89 option was cancelled early in the model year AND LS5 and LS6 was a late introduction, you would have to assume that Chevelle production happened evenly throughout the year for these numbers to work.
I agree with Alan F's calculations. For the past couple of years, I've been working on a poster that will show detailed production totals for all the '68-'72 Chevrolet A-bodies. Where there are holes in the data, I have been using simple statistical interpolation to generate *unbiased* estimates.

One of the things that got me started on this was the ever-lower totals being quoted for the LS6 convertible and El Camino. I've heard numbers as low as 10 convertibles and 20 El Caminos. I don't buy that for a second. There were at least 4,475 total LS6 vehicles. That is known. So I'm supposed to believe that there were 10 convertibles, 20 El Caminos, and 4,445 coupes !? No way was it that lopsided.

Ater applying my statistics I came up with about 95 convertibles and about 500 El Caminos. Now that sounds like a lot of LS6 El Caminos. Who would have wanted such a car ? Could that many have been sold ?
Well, I would have wanted one and yes, I think that many could have been sold. The same question could be asked about the 1968's. Who would have wanted a 1968 SS-396 El Camino ? In '68 the exact totals for the SS El Camino are known. Apparently a lot of people wanted a '68 SS-396 El Camino since 8.25% (5,190) of all SS A-bodies sold in 1968 were El Caminos.

Note that 8.25% of 4,475 is about 370. So an estimate of 500 may be a little high. But then again, there were no less than 3 genuine LS6 El Caminos running around, my rather small home town in the 1980s.
1970 air cleaner information ........
Can anyone tell me what the original air cleaner is for a late Chevelle SS (L34)? I have seen "original" mid to late year cars with chrome open element air cleaners yet the assembly manual shows the closed and is dated early 1969. Was there a transitionary period or did they just use up what they had before changing? What is correct?.
some 1970 air cleaner, [box 55] buildsheet codes ...
"SS" in box 55 stands for open element air cleaner. w/No cowl induction
"DG" in box 55 is the air cleaner, and is normally associated with ZL2 cowl induction option.
"CO" in box 55, is normally associated with, the dual snorkel air cleaner.
"CQ" in box 55, is normally associated with, the L65 engine.
"CJ" in box 55, is normally associated with, the L48 engine.
"CE" in box 55, is possibly associated with, the 6 cylinder engine.
A side note.
A Factory installed Dual snorkel air cleaner on a 1970 Chevelle LS-6 will show a "CO" code in box #55 of it's buildsheet.
I agree also that NO 1970 L-78 Chevelle, or L-34 & LS-5 for that matter, received them, as they were a later issued, Non Cowl Induction,
solid lifter engine only, application air cleaner.
.

Some non-cowl induction LS6's did have a dual snorkel air cleaner.
I've heard it's the rarest air cleaner option for 1970.
The dual snorkel air cleaner used on later non-cowl induction LS-6 Chevelles in 1970 was also used on later 1970 Nova SS396 L-78 cars and also perhaps a few 1970 Camaro SS396 L-78 cars. The earlier production versions started out using the 14" open element design but ended production with the dual snorkel closed element design.
They did not use it again after 1970.
In 1971 - 72 the non-c.i., non a/c Chevelle SS454s used a different dual snorkel air cleaner.
Cowl induction lid, chrome or black?
If your are referring to a 1970 Application:

Cowl Induction = Black

Non Cowl induction Open Element = Chrome

"Rare" Non Cowl induction Dual Snorkle = Chrome

Make Sure you use the Correct Black Wing Nut with The black Air Cleaner Lid if you have Cowl Induction.

I believe there may have been variations on application of Chrome/Black and a differant Dual Snorkle Air Cleaner in 1971-1972.
There were actually 3 different air cleaners in 1971 & 1972 on LS-5 Chevelle SS454s.

Typically you find the open-element style with the foam seal that goes around the base and the single snorkel. This one is used on the Cowl Induction cars. It had a chrome lid in 1971.

For non cowl-induction cars there was a closed element style with a chrome lid. It is most often seen with a single snorkel, but on cars that came without air conditioning they came with twin snorkels. Each snorkel had the flapper valve (Thermac) to force air through the hot air duct that drew in air from the heat sheild near the exhaust manifold. This is not the same air cleaner as used on the '70 LS-6.

The same ones were used again in 1972 but they dropped the chrome lid and the 'Turbo-Jet 454 365 horsepower' decal that they all used. The '71 big block engine decals were unique to that year BTW.
In keeping with the theme of correctness, several styles of air cleaners used on Chevelles, but one special design was used on Chevelles with the cowl induction hood. However, even though very similar there were two different varieties used.
The difference is in the bases of 1970 models and the 1971, 1972 versions. In 1970 the air cleaner has a large base with a single snorkel. The snorkle is tapered, smooth an uninterupted unit. The base also has a crankcase vent tube.
The 1971-1972 air cleaner is almost identical with the exception of the snorkel and two appendages on the base of the cleaner. These extra features make up the thermostatically controlled air cleaner, and were not used on the 1970 model year. So ...... if you have a 1971 or 1972 with cowl induction and want to be correct the air cleaner must have the "thermmostatic components" on it to be correct.
1970 key information ........
does anyone know where i can get GM or Chevrolet OEM or NOM 1970 blank keys? (ignition & doors/trunk) i believe they were styled diffrently then the 80's keys, i could be wrong.
I have an original Briggs book that has every key and lock for every model American car from 1954 (i think) to the early 80's. If anybody needs OEM lock or key numbers let me know.
Just a little trivia - Briggs and Straton, the small engine company, made the keys.
1970-72 Cowl Induction parts information ........
Yes, remove the flow control valve and it will open up very fast but the only problem with that it will wear out your vacuum pod :yes:


Flow control valve:



VACUUM POD ACTUATOR:


Some good information above, and here are some additional comments.
First, there is a good purpose for the flow control valve (or check valve). The vacuum source, which actuates the vacuum pod for the outer door, needs to come from a GOOD manifold source (coming off of one of the intake runners is good). The flow (or check) valve is basically a one way valve. It allows strong flow in only one direction and VERY weak flow in the other direction. THE VERY BEST check valves were the original factory valves. Frequently, the replacement and/or repo valves don't work as good as the originals. The check valve's function is to allow the vacuum supplying the pod to suddenly drop under power or hard acceleration conditions (when manifold vacuum drops real low). Then, as manifold vacuum returns, the check valve permits a VERY weak flow of vacuum to the pod so that it closes slooooooooooooooooooooowly. Another thing which affects the functioning of the pod is the strength of the spring inside the pod. A weaker spring won't open the door quite as quickly as a strong spring. BUT, a strong spring may prevent the vacuum source from closing the door. Not all pod springs and check valves are created equal.
Furthermore, as already mentioned, a cam profile will have a definite affect on the vacuum levels.
MOST OF THE TIME, if you do not have the check valve in the vacuum line, the outer door will open very quickly AND CLOSE very quickly. Thus, the desired effect of the opening/closing of the outer door is less than desired. The door should open quickly under strong acceleration (or heavy power conditions) and then close somewhat slowly. The slower the door closes, the better the visual effect (if that's what you like, and I do!).

Under hard acceleration, this valve allows the door to open quickly, but is supposed to close it slowly. The ONLY thing that closes the outer door is manifold vacuum from the engine, thus, if the engine is not running, the door should NOT be closed!
The outer door is not so much functional, but is more for "show". The inner door, which is operated by an electric solenoid that is activated by a switch on the gas pedal, is the door that is really functional for allowing more air to the engine.
In the entire automotive world, particularly the performance world, there is almost nothing that matches the "magic" effect of the 70-72 CI hood.
 
#13 ·
According to "chevrolet by the numbers" 1970-75 by Alan L. Colvin,
the 1970 turbo 400 numbers look like this.....
A)= 400 (Chevrolet)
B)= 454 (Chevrolet)
D)=400 (Chevelle & Monte Carlo)
F)=402 (Chevelle, Camaro & Nova)
G)=454 (Police)
J)=402 (truck 10-30 series)
K)=350 (Corvette)
R)=454 (Chevelle)
S)=454 (Chevelle, Monte Carlo & Corvette)
W)=402 (Chevelle, Camaro & Nova)
Y*)=454 (Chevelle & Corvette).....(* high shift point).......
____

I have 2 other examples, of TH-400 numbers, just as generic as these samples......
..one is 1965-1975......the other one is 1969-1972.......
and this one..http://www.teufert.net/trans/t-400.htm..starts at 1971 ,and ends in 1976.....
__

Here is (4) different examples, I have seen......of what I believe is, the 1970 LS6 Chevelle code......

CY = 454 V8 Chevelle and Corvette...ron sessions
CY = 396 V8 Camaro......................ron sessions

CY*= (Chevelle & Corvette).....(* high shift point)...alan l. colvin

CY = 350, 396, 427, 454 / (245, 255, 425, 450hp)......smittyocat

CY*= 454ci 450hp (Chevelle) ,
........427ci 425hp (Chevrolet) ,
........427ci 430hp (Corvette) ,
........427ci 435hp (Corvette) ,
........396ci 375hp (Chevelle, Nova, Camaro) ,(High Shift Point)..chevellestuff.com/1969 POP decoding..
_

I realize it's hard to get information correct, without visually inspecting, either the number matching car, the original buildsheet or the original protect-o-plate......

I have done, just that on these (5) examples of 1970 Super Sport cars....with th-400 transmissions..
I am pretty certain these are correct, because I used several different examples to extract the information, although the code could have been re-used in other Chevrolet models...in different years...and applications...

(CF) = L34 Chevelle SS396 (350hp)
(CR) = LS5 Monte Carlo SS454 (360hp)
(CS) = LS5 Chevelle SS454 (360hp)
(CW)= L78 Chevelle SS396 (375hp)
(CY) = LS6 Chevelle SS454 (450hp)

Can anyone dispute these (5), 1970 Super Sport transmission useage codes as being, wrong ???

I am sure with all the big block cars built in 1970, some of these transmission codes could have been re-used in Impala's, Camaro's, Corvette's, Nova's, ect......................

I guess my point is, when these $29.95 books are wrong, some of the (free) information on the web
"IS PROBABLY" going to be wrong, also......just, because someone used the inaccurate book as their reference materials..and I am as guilty, as the next guy....I usually, use all 5 of these sources to get my transmission decoding info, and will continue to use them all, with a grain of salt...............Don.
hello
i cant find my TH 400 decoding :C79261B from excalibur phaeton 3 1979
the year is 1979 ok but what is the HP ?
thanck you Michel
 
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