66-67 BBC Harrison Radiator research report - Chevelle Tech
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  #1  
Old Sep 7th, 09, 11:54 PM
jeffschevelle jeffschevelle is offline
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Default 66-67 BBC Harrison Radiator research report - UPDATED 9/20/09

***UPDATED 9/20/09***

Below is a complete (and very long) report on every Harrison Radiator application for 66 and 67 big block Chevelles, and the associated part numbers, codes, and other information. I had to break it into 3 posts due to size. Grab a Coke (or a Budweiser) before you start reading, ‘cause it’s a lot of info to digest!!

[Part 1]

Intro and credits:

Questions are posted on TC about 66-67 Chevelle big block Harrison radiators on almost a weekly basis. The responses are sometimes right and sometimes wrong, but mostly somewhere in between! So I’ve been working over the last couple of months to pin down the various applications, codes and part numbers as much as possible, based on the Assembly Instruction Manuals, original Chev. Parts dept. catalogs from 1966 and 1967, and original cars, radiators and build sheets. Additional data has also been taken (with permission) from numerous pics provided by Mike Crown from cars he’s inspected; from several radiator ID tag pics posted on TC in the past; and (with permission) from ID tag info shown on Dale McIntosh’s 67 reference CD. All the information assembled so far is set out below.

You will see several items that still have questions or blanks. So some help from TC members would be appreciated to fill in the remaining holes. If you have a 66 or 67 SS396 or factory big block elCamino that you know for a fact still has its original radiator (especially if it still has its part number / build sheet code tag in place), then please send me the info on your radiator and some good pics. My direct email is jeffhelms@ctc.net . I’ll update this post each time we get any new, concrete info.

Here we go! –

Contents:
I. Definitions
II. General Info / misconceptions / questions
III. Summary of the HD radiator options
IV. Date Codes; Meaning of Tank codes; Tags
V. Applications, Part numbers, Tank codes, and Build sheet codes
I. Definitions of terms used below:
· P/N = part number
· B/S = build sheet
· AIM = Factory Assembly Instruction Manual
· P&A = Parts and Accessories catalog (Corvair, Chevy II, Chevelle, Camaro edition)
· L35 = 396 c.i. 325 HP (66 and 67)
· L34 = 396 c.i. 360 HP (66), or 396 c.i. 350 HP (67)
· L78 = 396 c.i. 375 HP (66 and 67)
· PG = Powerglide automatic transmission (66 and 67)
· TH400 = Turbo-hydramatic 400 automatic transmission (67 only)
· AT = either automatic transmission (PG or TH400)
· A/C = RPO C60 factory in dash air conditioning
· AIR = RPO K19 Air Injection Reactor Equipment (“smog”)
· HD Rad = RPO V01 heavy duty radiator (without A/C)
II. General Info / misconceptions / questions:
A. First, the applications are not identical for 66 and 67 396 Chevelles. In 67 Chevy down-graded the standard L35 radiator to a unit that has smaller tanks (with a center fill hole) and a thinner core than the 66 standard unit. (It is still a 3 row core but it is not as thick as the 66 standard 3-row unit.) So when you see general statements about 66 and 67 Chevelle radiators lumped together, they are not always correct for the 67’s. The data below is separated by year.

B. Second, there are only three basic sizes of 66-67 Chevelle big block radiators. There are multiple variations of each size based on transmission, shroud or non-shroud applications, etc. But they are all essentially based on one of these three basic units:
1. The standard 67 L35 radiator. For shorthand, I refer to this as the “Small” radiator below.
Photo by Jeff Helms:

Photo by Jeff Helms:
The Small 67 radiator's general description and approximate dimensions are:

Tank thickness (at a wide rib): 2-1/4 in.
Fill hole location: Center
3-row core
Core thickness on top plate (the flat piece that is soldered to the top tank): 2-3/4 in.
Core thickness at cooling fins (the body of the core): 1-7/8 in.
All have a finger guard
Mounting brackets have only one side (to mount to the radiator support). It does not have provisions for mounting a fan shroud.
2. The standard 66 L35 & L34 radiator. For shorthand, I refer to this as the “Medium sized” radiator below.
Courtesy Mike Crown:

Photo by Jeff Helms:
The Medium sized radiator's general description and approximate dimensions are:
Tank thickness (at a wide rib): 2-5/8 in.
Fill hole location: Driver’s side
3-row core
Core thickness on top plate (the flat piece that is soldered to the top tank): 3-1/8 in.
Core thickness at cooling fins (the body of the core): 2 in.
Units built for non-shroud applications have a finger guard. Units built for fan shroud applications do not have a finger guard.
Mounting brackets are “U” shaped channels with two sides – one to mount to the radiator support and one for mounting a fan shroud (if applicable).
3. The infamous and elusive 4-row (or so-called “4-core”) radiator. For shorthand, I refer to this as the “Large” radiator below.
Photo by Jeff Helms:

Photo by Jeff Helms:
x
The Large radiator's general description and approximate dimensions are:
Tank thickness (at a wide rib): 3 in.
Fill hole location: Driver’s side
4-row core
Core thickness on top plate (the flat piece that is soldered to the top tank): 3-1/2 in.
Core thickness at cooling fins (the body of the core): 2-5/8 in.
Units built for non-shroud applications have a finger guard. Units built for fan shroud applications do not have a finger guard.
Mounting brackets are “U” shaped channels with two sides – one to mount to the radiator support and one for mounting a fan shroud (if applicable).
Also attached is a pic of two Middle sized 3-row radiators (left and center), and the Large 4-row (right), for comparison. (I did not have a Small 67 3-core radiator out of a car to put in the picture).
Photo by Jeff Helms:
C. Third, I am uncertain about what was the standard radiator for a 67 L34. The 67 AIM suggests that an L34 got the “Small” 3-row radiator (same as a 67 L35) if it had a manual trans or PG, and that it got the “Medium sized” radiator if the L34 was mated to a TH400. But I have seen several allegedly original 67 L34 4-speed cars with the Medium sized radiator with a finger guard and no shroud. So we need some help from the TC members to pin this question down.
III. Summary of the HD radiator options:

There has been a lot of incorrect information (or over-generalizations at least) circulated in the past about the HD radiator option. In particular, the general statement that all 66-67 big block HD radiators had 4-row cores is not correct; and the statement that AIR always got the same radiator as A/C or HD Radiator is also not correct for an L34.

Also, it should be noted that having or not having an HD radiator did not affect whether the car came with a clutch fan or the standard fixed 4-blade fan. That was based on engine HP, whether A/C was ordered, and whether the RPO K-02 clutch fan was ordered (without A/C).

Below is a summary of what “changed” as a result of ordering an HD radiator, or A/C, or AIR (or a combination of those). The specific p/n’s, B/S codes and tank codes are all set out in Section IV below. But sometimes it helps to get the “big picture” first from a general description, before getting into the #’s and alphabet soup -

66 L35 - Ordering the HD radiator option (or A/C or AIR) got a radiator that is absolutely identical to the standard L35 radiator (the Medium sized 3-row unit), except that the HD unit has no finger guard because it came with a shroud. On a 66 L35, the “HD” only meant addition of the fan shroud (which increased air flow, which increased cooling capacity, which is was what made it “heavy duty”). Attached are pics of the two radiators side by side. The standard unit is on the left (the finger guard is broken off but the mounting legs are still there), and the HD unit is on the right. Other than the finger guard, there is no difference whatsoever between them, including the tank design, core size, number of rows, row spacing, cooling fin spacing, and brackets:

Photo by Jeff Helms:

Photo by Jeff Helms:

Photo by Jeff Helms:
NOTE: There are some Medium sized radiators floating around out there that have 4-row cores in them; but every one of those that I have ever seen (including the one in my 66 SS convertible that I purchased from Mike C) has had a core replacement at some point in time. Every single original 66 Medium sized HD radiator that I have seen is a factory 3-row core unit.
- L35’s got a fixed 4-blade fan, unless A/C or RPO K-02 was ordered (in which case a clutch fan was used). Ordering AIR or HD radiator did not change the fan.

66 L34 - Ordering AIR only (without A/C or HD radiator) did not change the size of the radiator (it stayed at the Medium sized 3-row unit), but it added a shroud and dropped the finger guard.

- Ordering the HD radiator option or A/C on an L34 (alone or together with AIR) bumped the radiator up to the Large 4-row unit without a finger guard, and added a shroud.

- L34’s got a fixed 4-blade fan, unless A/C or RPO K-02 was ordered (in which case a clutch fan was used). Ordering AIR or HD radiator did not change the fan.

66 L78 - Based on my research and photos from two unrestored 66 L78's without HD radiator, 66 L78’s got the Large 4-row unit with a finger guard and without a fan shroud as a standard part of the L78 package. So ordering the HD radiator option with a 66 L78 only added the shroud and dropped the finger guard. The basis for this conclusion is set out in the p/n section below.

- All L78’s got a clutch fan. (A/C and AIR were not available on a 66 L78.)


67 L35 - Ordering the HD radiator option (or A/C or AIR) bumped you up from the standard “Small” 3-row 67 unit to the Medium sized (66-style) 3-row unit without a finger guard, and added a shroud.

- L35’s got a fixed 4-blade fan, unless A/C or RPO K-02 was ordered (in which case a clutch fan was used). Ordering AIR or HD radiator did not change the fan.

67 L34 - If 67 L34’s came standard with the Small radiator (see question in Sec. C above), then adding AIR (without A/C or HD radiator) bumped it up to the Medium sized 3-row unit without a finger guard, and added a shroud. If 67 L34’s already came standard with the Medium sized 3-row unit with finger guard, then adding AIR alone (without A/C or HD radiator) left the radiator size at the Medium sized unit, but added the shroud and dropped the finger guard.

- Either way, ordering the HD radiator option or A/C on an L34 (alone or together with AIR) bumped the radiator up to the Large 4-row unit without a finger guard, and added a shroud.

- L34’s got a fixed 4-blade fan, unless A/C or RPO K-02 was ordered (in which case a clutch fan was used). Ordering AIR or HD radiator did not change the fan.

67 L78 - Based on my research I believe that 67 L78’s got the Large 4-row unit without a finger guard and with a fan shroud as a standard part of the L78 package. As such, there was no “HD radiator” option available for a 67 L78 (since it already had the biggest available radiator and a fan shroud). Likewise, a 67 L78 with AIR got the same Large 4-row unit with a fan shroud. The basis for this conclusion is set out in the p/n section below. But we still need to get confirmation from any lucky TC member who has a 67 L78 with its original radiator.

- All L78’s got a clutch fan. (A/C was not available on a 67 L78.)

[End Part 1- Continued below]

Last edited by jeffschevelle; Sep 20th, 09 at 2:25 PM.
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  #2  
Old Sep 7th, 09, 11:56 PM
jeffschevelle jeffschevelle is offline
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Default Re: 66-67 BBC Harrison Radiator research report

[Part 2] ****UPDATED 9/20/09****

IV. Date codes; Meaning of Tank codes; Tags:

With very few (if any) exceptions, all original 66-67 Harrison radiator tanks should have a 2-letter identification code on them. The top tanks will also have a smaller third letter in between the two larger letters, which is a date code. There is also a date code stamped on the mounting channel on the driver's side.

Date Codes - The date code on the top tank is the month when the tank was stamped out. It is the usual letter-per-month format, with the letter 'I' omitted (so M=December).

The date code on the mounting channel on the driver's side is the date the channels were stamped out and/or the date the strap assembly was made. That date should be the same as the upper tank date, or one month before, or one month after.

So, if a car has its original radiator, the tank date code or the strap date code (whichever one is later) should match or precede the car's body build date on the cowl tag (bearing in mind that a car with a 05D cowl tag date, for example, could easily have a E dated radiator that was assembled earlier that same month).

Tank Codes - If you think about how the Harrison radiator assembly line would have worked, each radiator was an assembly of several parts - a top tank, a bottom tank, a core, and a set of straps and mounting channels (and in some cases a finger guard). The large 2-letter stamping is just the identification code for the tank itself. They are the rough equivalent of a build-sheet code for the tank piece for the Harrison radiator assembly line worker. Since the same tank could be used on multiple different radiator applications, the same tank codes can be seen on different radiators as long as the tank is the same (even though the radiator p/n’s and the Chevrolet B/S codes for each radiator are different).

With that said, I have seen three Middle sized 3-row radiators that did not have a visible top tank code (but did have the date stamp). The normal code for that top tank is UP (see below). All three of those unstamped tanks have been dated J or K (Sept. or October, of either 65 or 66, unless they are service replacement radiators). I don’t know if this was just an odd batch of top tanks that did not get stamped, or if all three of those radiators were later service replacement units.

B/S Tags - Harrison attached this small metal tag to the lip of the top tank, showing the Chevrolet p/n and Chevrolet B/S code. Once the radiator was completed and shipped, to Chevrolet, the tank codes were irrelevant to the Chevrolet assembly line worker, and only the p/n and B/S code on the metal tag mattered. Example:

Photo by Jeff Helms:


Core ID tags (maybe ??) - In rare cases (on original radiators that have never been to the repair shop) you also see an additional very small metal tag attached to the top lip of the core (where it mates to the top tank) with another 2-letter code on it. Example:

Photo (and blur) by Jeff Helms:


I have seen speculation that this tag shows the assembly date of the entire radiator unit. However, I can find no way to make any workable date combination out of the letters seen on different tags. In addition, I have seen the same “BG” tag on multiple Middle sized 66 radiators with widely varying tank dates; which makes it less possible that the small tag was an assembly date code (there is no way that three radiators with tanks stamped many months apart would all have the same radiator assembly date).

All those 66 radiators with BG tags (all of which have exactly the same core) have led me to believe now that this small tag is the Harrison identification code for the Core itself (used by the Harrison assembly line worker the same way as the tank codes discussed above). But that is just educated speculation. Unless many more radiators with that small tag are found, we’ll never know for sure. I have listed this code below under the applications where I have seen the BG tag present.


V. Specific applications, p/n’s, B/S codes, and tank codes:

- 1966 L35 or L34 with Manual Trans:
P/N – 3007620 (this is a “Medium sized” 3-row radiator with finger guard)

B/S code – VX

Finger guard
Cap on Driver’s side
Top tank code – UP
Bottom tank code – CS or LY.
- CS seen on unit dated L (Nov. 1965 or 1966, year uncertain).
- LY seen on unit dated K (Oct. 1965 or 1966, year uncertain).
- LY seen on unit dated E (May 1966 or 1967, year uncertain).
- LY seen on unit dated G (July 1966 or 1967, year uncertain).

NOTE – we need some help on pinning down exactly when this tank code changed.
Core ID (?) tag – BG (seen on multiple original radiators with VX tags)

Sources for p/n and B/S code info –
- 66 AIM, Sec. 11-13, Pg A-8
- P&A dtd 7-1-66
- Original 620VX radiator with B/S and P/N tag, picture attached
- Multiple pics of VX tags on T.C.
Photo by Jeff Helms:


Courtesy Mike Crown:



- 1966 L35 or L34 with PG:
P/N – 3007621 (this is a “Medium sized” 3-row radiator with finger guard)
Identical to a 3007620 except it has trans cooler lines.

B/S code – VY

Finger guard
Cap on Driver’s side
Top tank code – UP
Bottom tank code – DC, BK or BG.
- DC seen on unit dated J (Sept. 1965, year verified).
- DC seen on unit dated M (Dec. 1965, year verified).
- BK seen on unit dated C (Mar. 1966, year verified).
- BK seen on unit dated K (Oct., believed to be 1966).
- BG seen on unit dated B (Feb., believed to be 1967).
- BG seen on unit dated F (June, believed to be 1967).

NOTE – we need some help on pinning down exactly when this tank code changed.
Core ID tag (??) – Unknown, but should be BG (unverified)

Source for p/n info –
- 66 AIM, Sec. M35, Pg A-27
- P&A dtd 7-1-66
Courtesy Mike Crown:

Courtesy Mike Crown:



- 1966 L35 with manual trans and A/C, AIR, and/or HD radiator;
and L34 with manual trans and AIR (without A/C or HD Radiator):
P/N – 3007622 (this is a “Medium sized” 3-row radiator without finger guard).
Identical to a 3007620 except for absence of finger guard.

B/S code – VZ

No Finger guard
Cap on Driver’s side
Top tank code – UP
Bottom tank code – CS or LY (see 3007620 notes above)
Core ID tag (??) – BG (seen on an original radiator with VZ tag)

Sources for p/n and B/S code info –
- Original 622VZ radiator from a 66 L35 with AC, with B/S and P/N tag (picture attached).

- Pic of VZ radiator in a 66 L34 with AIR (courtesy Mike Crown).

- 67 AIM Sec. K19 (AIR) pg A-8. (NOTE – Sec. K19 of the 66 AIM lists p/n 3007619 for L34 and L35. That is an obvious mistake because the 619 is a small block radiator and is smaller than any 396 radiator. This mistake is corrected in the 67 AIM which specifically lists 3007622.)

- There is no listing in Sec. C60 or Sec. V01 of the 66 AIM for the p/n of the HD unit applicable to an L35 with manual trans. However, 3007620, 3007621 and 3007623 are all listed, and this is in the proper sequence (both as to p/n and B/S code VZ for p/n 3007622 versus VX for 3007620).
Radiator from L35 manual AC car (Photo by Jeff Helms):


Radiator in L34 manual with smog (Courtesy Mike Crown):



- 1966 L35 with PG and A/C, AIR, and/or HD radiator;
and L34 with PG and AIR (without A/C or HD Radiator):
P/N – 3007623 (this is a “Medium sized” 3-row radiator without finger guard)
Identical to a 3007621 except for absence of finger guard.

B/S code – VK

No Finger guard
Cap on Driver’s side
Top tank code – UP
Bottom tank code – DC, BK or BG. (see 3007621 notes above)
Core ID tag (??) – BG (seen on an original 66 L35 AC radiator)

Sources for p/n and B/S code info –
- 66 AIM Sec. K19 pg A-8 (AIR), Sec. C60 (A/C) pg B-3, and Sec. V01 (HD Rad) pg A-1.
- Original 623VK radiator with B/S and P/N tag, picture attached (P/N is not visible due to the shroud, but I did loosen the shroud and confirm it is stamped 3007623)
Photo by Jeff Helms:

Photo by Jeff Helms:


[End Part 2, continued below]

Last edited by jeffschevelle; Sep 20th, 09 at 2:22 PM.
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  #3  
Old Sep 7th, 09, 11:56 PM
jeffschevelle jeffschevelle is offline
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Default Re: 66-67 BBC Harrison Radiator research report

[Part 3] ****UPDATED 9/20/09****

- 1966 L34 with manual trans and A/C or HD radiator:
P/N – 3010208 (this is a “Large” 4-row radiator without finger guard.)

B/S code – VI

No Finger guard
Cap on Driver’s side
Top tank code – UN
Bottom tank code – BP

Core ID tag (??) – AK (maybe - the A was very hard to read. Seen on original VI tagged 4-row)

Sources for p/n and B/S code info –
- Multiple pics on TC, and from Mike C., of manual trans 4-row radiator with VI B/S tag. One picture is attached.

- 66 and 67 AIM Sec. C60 (A/C) pg B-3, and Sec. V01 (HD Rad) pg A-1.
(NOTE – Those Sections of the 66 AIM list p/n 3010203 for manual and 3010209 for AT. That is a typo and is corrected in the 67 AIM which specifically lists 3010208 and 3010209. P/N 3010208 is also listed in the Chev. Parts History index and the superceding p/n is in the P&A dtd 10-1-66 for this application. P/N 3010203 is not listed in any of the parts books.)
Note - this pic is from a fan shroud car, the shroud is just taken off. Note the small tag, appears to be AK,but unclear. Courtesy Mike Crown:


Courtesy Orlando Cruz:


- 1966 L34 with PG and A/C or HD radiator:
P/N – 3010209 (this is a “Large” 4-row radiator without finger guard)
Identical to a 3010208 except addition of trans cooler lines.

B/S code – Unknown. Can anyone help??

No Finger guard
Cap on Driver’s side
Top tank code – UN
Bottom tank code – BR
Core ID tag (??) – AK (maybe)

Sources for p/n info –
- 66 and 67 AIM Sec. C60 (A/C) pg B-3, and Sec. V01 (HD Rad) pg A-1.
Bottom tank of Large 4-row for Automatic:



- 1966 L78 with manual trans, without HD radiator option (1966):
P/N – ___??___ (this is a “Large” 4-row radiator with finger guard)

The p/n may be 3010311, but there may also have been an earlier P/N prior to November of 1966. See notes below. Needs verification from an original 66 L78 without fan shroud.)

B/S code – VM (verified from Original survivor 66 L78,and also from at least two real 66 L78 build sheets.)

Finger guard
Cap on Driver’s side
Top tank code – UN
Bottom tank code – BP
Core ID tag (??) – AK (maybe)

Sources for p/n and application info –
- 66 AIM Sec. L78 pg A-2, indicates that a different radiator (p/n not listed there) was used for L78 versus the production 396 radiator (which was 3007620 VX with finger guard). It also states that this unidentified p/n radiator “assembles same as prod. 13817-67" -- in other words, without a fan shroud. Which means it had to have a finger guard.

- Two original 4-row 66 manual radiators with finger guards (UN and BP tanks) in unrestored 66 L78 Convertible owned by TC member 66_L78_Ragtop, and in unrestored 66 L78 coupe. See attached pics below.

- Real 4-row 66 manual radiator (dated B, Feb. of 1966) that had a finger guard, removed from a wrecked, engineless 66 Chevelle SS some 25+ years ago. Pictures are attached below. The two bright silver areas on top are where the two legs of the finger guard were attached. (The radiator shop that recored it removed and discarded the two finger guard pieces contrary to my instructions!!). Since it had a finger guard it had to be a non-shroud car. And since all L35’s and L34’s with HD Radiator or AC or AIR received a fan shroud, the only other possibility for this radiator is that it was the “standard” unit for L78 without a shroud.

- In the 7-1-1966 parts book, p/n 3010311 is listed as "second design" for L34 w/ AC or HD radiator (which has a shroud), and for L78 without HD radiator (which does not have a shroud). So this would be a 4-row unit, and it would have a finger guard so it could be used in service replacement with or without a fan shroud for all the listed applications. The p/n 3010311 also replaced p/n 3010208 (4-row without finger guard) in November of 1966 for all 4-row manual service replacement applications, but the 67 AIM continued to list p/n 3010208 for assembly line usage for fan shroud applications. Based on all of that, I believe 3010311 to be the p/n for the 4-row unit with a finger guard. But I do not know what the “first design” p/n was.
66 L78 convertible - note the finger guard mounting legs (Courtesy Orlando Cruz (66_L78_Ragtop):


Survivor 66 L78 Coupe - Note the finger guard in the upper left corner of the picture (Courtesy Orlando Cruz):

Photo By Jeff Helms:



- 1966 L78 with manual trans, with HD radiator option:
P/N – 3010208 (this is a “Large” 4-row radiator without finger guard.)


B/S code – VI

Same radiator as L34 manual with HD radiator – See full description and pics above.
************************************************** *****************************************
- 1967 L35 with Manual Trans:
P/N 3012137 (this is a “Small” 3-row radiator with finger guard)

B/S code – VU

Finger guard
Cap in Center
Top tank code – UC
Bottom tank code – BU
Core ID tag (??) – Unknown

Sources for p/n and B/S code info –
- 67 AIM, Sec. 11-13, Pg A-8
- P&A dtd 10-1-67
- Photograph of original tag on Dale M’s 1967 Chevelle reference CD
Courtesy Dave Nickles:

Courtesy Dale McIntosh:



- 1967 L35 with PG or TH400:
P/N – 3013424 (this is a “Small” 3-row radiator with finger guard)
Identical to a 3012137 except addition of trans cooler lines.

B/S code – Unknown, but is probably VV or VW (need verification)

Finger guard
Cap in Center
Top tank code – UC
Bottom tank code – Unknown.
Core ID tag (??) – Unknown

Sources for p/n –
- 67 AIM, Sec. M35, Pg A-22
- 67 AIM, Sec. M40, Pg A-10
- P&A dtd 10-1-67
- 1967 L34 with Manual Trans:
Per the AIM, the L34 manual radiator is the same as 67 L35 manual above (P/N 3012137-VU “Small” 3-row radiator with finger guard). But see question under Section II.C. above as to whether the 67 L34 manual instead came with the “Medium sized” 3007620-VX radiator with finger guard (described under 66 L35 and L34 manual above).

Sources suggesting “Small” radiator is correct –
- 67 AIM, Sec. L34, does not indicate that it got a different radiator than production 396.

- 67 AIM, Sec. M35 pg A-22, indicates that any “396” engine (L34 or L35) with PG got the Small radiator.

- By contrast, 67 AIM Sec. M40 pg A-10 specifically states that L35 gets the Small radiator with TH400 and L34 gets the Medium sized 3007621 radiator with TH400. If L34 is listed there to get the bigger radiator, then you would expect it to also be listed in Sec. M35, or in Sec. 11-13, or in Sec. L34. But it is not.
Sources suggesting “Medium sized” radiator is correct –
- P&A dtd 10-1-67, which specifically says that the two Small radiator p/n’s are not applicable for L34 (although it does not list any other p/n for L34 without HD radiator or A/C).

- Multiple claimed original 67 L34 cars with medium sized radiators with finger guards (3007620-VX unit)
- We need verification from some confirmed original 396/350HP 67’s.
- 1967 L34 with PG:
Per the AIM, the L34 PG radiator is the same as L35 PG above (P/N 3013424 “Small” 3-row radiator with finger guard). But this has the same question noted under L34 manual above as to whether the 67 L34 with PG instead came with the “Medium sized” 3007621-VY radiator with finger guard (described under 66 L35 and L34 PG above).

- We need verification from some confirmed original 396/350HP 67’s.
- 1967 L34 with TH400:
P/N – 3007621 (this is a “Medium sized” 3-row radiator with finger guard – see full description under 66 L34 PG above).

B/S code – VY

Source for p/n –
- 67 AIM, Sec. M40, Pg A-10
- 1967 L35 with manual trans and A/C, AIR, and/or HD radiator;
and L34 with manual trans and AIR (without A/C or HD Radiator):
P/N – 3007622 (this is a “Medium sized” 3-row radiator without finger guard – see full description under corresponding 66 section above)

B/S code – VZ

Sources for p/n –
- 67 AIM Sec. K19 (AIR) pg A-8.
- 67 AIM Sec. C60 (A/C) and Sec. V01 (HD Rad.) just say “396” and do not separate L34 from L35 for the p/n of the HD unit; and they only list the p/n’s for the Large 4-row units. However it is known that 67 L35’s with A/C did not come with the Large 4-row radiator. The correct unit is the Medium sized” 3-row radiator.
- 1967 L35 with AT and A/C, AIR, and/or HD radiator;
and L34 with AT and AIR (without A/C or HD Radiator):
P/N – 3007623 (this is a “Medium sized” 3-row radiator without finger guard – see full description under corresponding 66 section above)

B/S code – VK

Sources for p/n–
- 67 AIM Sec. K19 (AIR) pg A-8.
- 67 AIM Sec. V01 (HD Rad.) pg A-1.
- See note above regarding 67 AIM Sec. C60 (A/C) reference to “396”.
- 1967 L34 with manual trans and A/C or HD radiator:
P/N – 3010208 (this is a “Large” 4-row radiator without finger guard – see full description under corresponding 66 section above)

B/S code – VI

Sources for p/n –
- 67 AIM Sec. C60 (A/C) pg B-3, and Sec. V01 (HD Rad) pg A-1.
- 1967 L34 with AT and A/C or HD radiator:
P/N – 3010209 (this is a “Large” 4-row radiator without finger guard – see full description under corresponding 66 section above)

B/S code – Unknown

Sources for p/n info –
- 67 AIM Sec. C60 (A/C) pg B-3, and Sec. V01 (HD Rad) pg A-1.
- P&A dated 10-1-67
- 1967 L78 with manual trans:
(NOTE: ** All info below needs verification from an original 67 L78.)

P/N – 3010208 (this is a “Large” 4-row radiator without finger guard and with fan shroud – see full description full description under 66 L34 manual HD Rad. section above)

B/S code – VI

Sources for p/n and application info –
- 67 AIM Sec. L78 pg A-3. It indicates that a different p/n (not listed there) was used for L78 versus the production 396 radiator; and it lists a “Radiator Shroud” as one of the non-illustrated parts that was standard with the L78 option package. The correct Large 4-row radiator with a shroud is p/n 3010208 (as listed under 66 L78 and L34 with HD radiator above).

- 67 AIM Sec. V-01 (HD Radiator) does not refer to L78 at all (it does in the 66 AIM). If 67 L78 came with a Large 4-row radiator and a shroud, then there was nothing left to upgrade. So it makes sense that there is no reference to L78 on the HD radiator option page.
- Needs to be verified on an original unrestored car.
[End]
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Last edited by jeffschevelle; Sep 20th, 09 at 2:24 PM.
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  #4  
Old Sep 8th, 09, 3:33 AM
davewho1 davewho1 is offline
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Default Re: 66-67 BBC Harrison Radiator research report

WOW - great job, Jeff; you put a lot of time into this - your efforts are much appreciated!
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  #5  
Old Sep 8th, 09, 6:49 AM
elcamino66 elcamino66 is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Thanks Jeff, Thats good stuff there. Lots of time to put that together.
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  #6  
Old Sep 8th, 09, 8:38 AM
66 MYSTERY CHEVELLE 66 MYSTERY CHEVELLE is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Thanks Jeff for all your hard work on this project!
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  #7  
Old Sep 8th, 09, 8:54 AM
Lionel-n-Chevelles Lionel-n-Chevelles is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Hi Jeff,
This is impressive, Thank You for all of your hard work. You did an Outstanding job.
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Old Sep 8th, 09, 9:49 AM
james a larson james a larson is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Good Work Jeff!
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  #9  
Old Sep 8th, 09, 10:19 AM
SebJr SebJr is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Nice job indeed nice to see that 3 speed with the VX tag too
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Old Sep 8th, 09, 1:09 PM
Xplantdad Xplantdad is offline
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Default Re: 66-67 BBC Harrison Radiator research report

I think that this should be stickied!

Thanks for your hard work Jeff
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Old Sep 8th, 09, 1:23 PM
Shevelle Shevelle is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Whew..information overload!! Great job Jeff!
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  #12  
Old Sep 9th, 09, 9:20 PM
AZCamino AZCamino is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Jeff,
Great information! I was particularly happy to see the information on the VZ radiator for the L35, 4-speed, with C60, like in my El Camino. Looks like my EC has its original radiator. I suspected so but did not know how to check date codes. Thanks!

VZ tag, BG core tag, UP upper tank with L date code, and CS lower tank, K strap code. El Camino has 12B Kansas build date.
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Last edited by AZCamino; Sep 9th, 09 at 10:16 PM.
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Old Sep 9th, 09, 10:13 PM
MileHiSS MileHiSS is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Jeff,

PM sent.
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  #14  
Old Sep 10th, 09, 1:56 AM
1966_L78 1966_L78 is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Great work...

Quote:
Originally Posted by Jeff
66 L78 - Based on my research and a photo from an unrestored 66 L78 without HD radiator, 66 L78’s got the Large 4-row unit with a finger guard and without a fan shroud as a standard part of the L78 package. So ordering the HD radiator option with a 66 L78 only added the shroud and dropped the finger guard. The basis for this conclusion is set out in the p/n section below.
Quote:
1966 L78 with manual trans, without HD radiator option (1966):
P/N – ___??___
(this is a “Large” 4-row radiator with finger guard)

The p/n may be 3010311, but there may also have been an earlier P/N prior to November of 1966. ... In the 7-1-1966 parts book, p/n 3010311 is listed as "second design" for L34 w/ AC or HD radiator (which has a shroud), and for L78 without HD radiator (which does not have a shroud)... Based on all of that, I believe 3010311 to be the p/n for the 4-row unit with a finger guard. But I do not know what the “first design” p/n was.
I have a radiator out of an original L78 car that was "parted out" years ago. Car was original and complete, except headers/shifter and wheels (still had the tach, the idler assembly, correct carb, etc). Had been parked since around 1975, and we got ahold of it around 1987. IIRC, the car was "04D" assembled in Fremont.

I still have the radiator, which I had recored in the early 90's (so the big code tag is missing, and I can't recall what it said, because I didn't think about asking for that to be saved) but the radiator is the #3007620, and matches your description of that radiator ("medium" size, finger guard, manual trans)... I found a tag soldered to the brackets (inside the "U" channel on the driver's side), with the part number and "Harrison"... I'll have to check again, but I thought I saw a code of "G 65" on the same bracket... The radiator is in the car, and i was checking with my flashlight...


Where are the top and bottom tank codes?
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  #15  
Old Sep 10th, 09, 3:10 PM
james a larson james a larson is offline
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Default Re: 66-67 BBC Harrison Radiator research report

Looking over the post again. Am I correct that a 66 L34 car with Manual Trans, without AIR and without AC and with a K-02 fan clutch should have a medium sized radiator With a Finger Guard and NO Shroud? But the same car with AIR would have had a Shroud?

However a 66 L35 car with manual trans, without AIR and without AC; but with a HD Radiator would have a Shroud an the mediumn sized radiator. Both with and without K-02?

Also here is a photo of a Harrison Radiator that has a top Tank that some people have said was used in the early SS cars.

Top tank is the same as the medium size radiator except the fill hole is on the passenger side; has a top tank code of U G with a little D between the letters. Bottom tank is the same as the medium size radiator for an automatic except the drain cock is in a different position. The code of the bottom tank is L O. The side mounting bracket has a C stamped into it. I believe this is actually for a 65 or 66, or 67 BB full size chevorlet as the core is actually 2" taller than the chevelle SS core. Anyone know what it is for sure?
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