Aluminum heads 3946074 - Chevelle Tech
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post #1 of 16 (permalink) Old Mar 12th, 09, 11:17 AM Thread Starter
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Tim
 
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Aluminum heads 3946074

My brother in law is working on a big block for a customer and the heads are as stated above, but they have a casting date of 6 20 70. My guess is they were service replacement heads for the L88 or ZL1.

Also, on the front of the head it is stamped 1476799. Maybe this is the partial VIN from the engine the heads were put on and the engine builder stamped them.

Any thoughts?

Tim
ACES # 6575
MCC # 643
1970 L78, Red on Red, 4 spd
1970 LS6, Misty Turquoise on Black, 4 spd
1970 L34, Black on Black, 4 spd
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post #2 of 16 (permalink) Old Mar 12th, 09, 11:43 AM
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Re: Aluminum heads 3946074

3946074....69&71...rect...OPEN...'69 427 L88, ZL1, Aluminum, 118cc chamber
'71 454 LS6, "round exhaust port"
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post #3 of 16 (permalink) Old Mar 12th, 09, 1:23 PM
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Albert
 
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Re: Aluminum heads 3946074

some builders stamp numbers to track heads that are sent out..maybe???

1969 9566AA COPO Chevelle
COPO 2
COPO motor
1969 Malibu 489 ZL-1 T 56
http://i518.photobucket.com/albums/u...DSC_0201-1.jpg
1969 Beaumont 454 ZL-1 6 spd..under construction
http://i518.photobucket.com/albums/u...DSC_0520-1.jpg
1969 300 2 door post 427 ZL-1 4 spd
http://i518.photobucket.com/albums/u...DSC_0055-1.jpg
1969 Z 28 X77 D 80 olympic gold
MCC#511 ACES #1805
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post #4 of 16 (permalink) Old Mar 12th, 09, 1:32 PM
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George
 
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Re: Aluminum heads 3946074

Those heads are not common.
With a 1969 cast date, they would be made from Unobtanium, end of 69 L-88 or ZL-1 427s. You could sell the heads (if not doctored) and have a very nice European vacation.

A late JUNE casting date in 1970, all is far from lost. Actual assembly could have put them out weeks later. Makes it possible that they would be on an EARLY PRODUCTION 71 LS-6 Vette which probably began production the last two weeks of AUG (would have to verify this date). Do not consider this the final word by any means.... I'm sure that like most other things, production was in batches...so 3-4 months lead for specialty-type stuff is certainly possible. NCRS generally accepts engine blocks up to three months prior to car build date...at least last time that i checked. With (IIRC) 188 LS-6 Vettes made in 71...will leave the end off that sentence.
Maybe best to do some research on LS-6 Vettes....compare head casting dates from known examples.....

I am likely to get a set from a pal off an old race engine needing repairs, 'over the counter' heads for sure w/74 casting date. Better for high rpm engines then a street cruiser for sure.

What project are those 074s are on?

See my gallery

George Kettler
o 70 Elky 496 build with #074 AL heads is done race weight should be 3895# with the AL heads and the thinner front race rubber. New combo, no times
o 68 Vette 427/M-20/3.36 23 year owner
http://public.fotki.com/kettbo/gearhead/
o 68 Camaro Vert 327 project, painted, assembly stage http://www.camaros.net/forums/showth...183654&page=55
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post #5 of 16 (permalink) Old Mar 12th, 09, 2:52 PM
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Jim
 
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Re: Aluminum heads 3946074

Production 71 LS-6 heads have a small square box stamped in the end of the head. Production L-89,L-88 Zl-1 have H C for Hi Comp stamped in the ends . If I could figure out how to load picts here I have a bunch of these I can post picts of. Real ZL-1 heads also have 2 studs in them for the extra mounting bosses on that block.

These heads are expensive to fix as the porositity of the aluminum was very bad, and they were know for dropping seats the death of many original numbered blocks.

Jim

Owner of Super Sport Sales and Service ,www.supersportsales.net Over 30 years of restoring Chevelle's for customer's Coast to Coast. Adward winning service since 1980! Frame off's to interiors,engine compartments,trunks and more ,Details make the difference! Expert LS6 L78 L34 Prepurchase Evaluation and Muscle Car locating service 302-420-4743
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post #6 of 16 (permalink) Old Mar 12th, 09, 4:19 PM
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George
 
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Re: Aluminum heads 3946074

yes, the set i am looking at did drop a seat and it did some evil damage. But nothing permanent. I'll be out for two Titanium valves too

George Kettler
o 70 Elky 496 build with #074 AL heads is done race weight should be 3895# with the AL heads and the thinner front race rubber. New combo, no times
o 68 Vette 427/M-20/3.36 23 year owner
http://public.fotki.com/kettbo/gearhead/
o 68 Camaro Vert 327 project, painted, assembly stage http://www.camaros.net/forums/showth...183654&page=55
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post #7 of 16 (permalink) Old Mar 12th, 09, 11:00 PM Thread Starter
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Tim
 
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Re: Aluminum heads 3946074

Quote:
Originally Posted by kettbo View Post
Those heads are not common.
With a 1969 cast date, they would be made from Unobtanium, end of 69 L-88 or ZL-1 427s. You could sell the heads (if not doctored) and have a very nice European vacation.

A late JUNE casting date in 1970, all is far from lost. Actual assembly could have put them out weeks later. Makes it possible that they would be on an EARLY PRODUCTION 71 LS-6 Vette which probably began production the last two weeks of AUG (would have to verify this date). Do not consider this the final word by any means.... I'm sure that like most other things, production was in batches...so 3-4 months lead for specialty-type stuff is certainly possible. NCRS generally accepts engine blocks up to three months prior to car build date...at least last time that i checked. With (IIRC) 188 LS-6 Vettes made in 71...will leave the end off that sentence.
Maybe best to do some research on LS-6 Vettes....compare head casting dates from known examples.....

I am likely to get a set from a pal off an old race engine needing repairs, 'over the counter' heads for sure w/74 casting date. Better for high rpm engines then a street cruiser for sure.

What project are those 074s are on?

See my gallery
It is at my brother-in-laws auto shop. All I know about it so far is, a customer went to the shop with a 69 camaro with a big block and these heads were on it. The owner of the car wants some engine work done to make more power.

Tim
ACES # 6575
MCC # 643
1970 L78, Red on Red, 4 spd
1970 LS6, Misty Turquoise on Black, 4 spd
1970 L34, Black on Black, 4 spd
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post #8 of 16 (permalink) Old Mar 13th, 09, 12:39 AM
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Brian
 
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Re: Aluminum heads 3946074

I have a set if 3946074 heads that I bought 6 years ago. I was going to use them on My next motor build but now that I need money to finish My car I am thinking of selling them. would these heads be correct for Z L-1/ L-88 corvetts. Dates are 2/11/69 and 2/24/69. These heads are not ported and are still original. I bought them from a guy who raced boats and heads had to be original .What are these worth? Here are some pictures. Thanks Brian

Last edited by blackmagic; Nov 29th, 09 at 11:03 AM.
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post #9 of 16 (permalink) Old Mar 13th, 09, 1:17 AM
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George
 
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Re: Aluminum heads 3946074

Geez Brian,
I'm sure there is some 69 ZL-1 Camaro or late 69 L-88 Vette guy out there willing to pay you a young fortune for them. PM me what you paid for them if you don't mind. I'm sure you will get your money back several fold.

George Kettler
o 70 Elky 496 build with #074 AL heads is done race weight should be 3895# with the AL heads and the thinner front race rubber. New combo, no times
o 68 Vette 427/M-20/3.36 23 year owner
http://public.fotki.com/kettbo/gearhead/
o 68 Camaro Vert 327 project, painted, assembly stage http://www.camaros.net/forums/showth...183654&page=55
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post #10 of 16 (permalink) Old Mar 13th, 09, 7:49 AM
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Brian
 
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Re: Aluminum heads 3946074

I've got a set of Jan '69 dated 074 heads that I'll take a "young" fortune for. They've been welded in three spots and the exhaust ports has been opened up, but they have new valves in them. No guide plates or rocker studs.
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post #11 of 16 (permalink) Old Mar 13th, 09, 11:37 PM
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George
 
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Re: Aluminum heads 3946074

Quote:
Originally Posted by buenymayor View Post
I've got a set of Jan '69 dated 074 heads that I'll take a "young" fortune for. They've been welded in three spots and the exhaust ports has been opened up, but they have new valves in them. No guide plates or rocker studs.

I'm afraid those guys who would pay big bucks for virgin sets will pay far less for modified/repaired heads. Even heads that have mods not showing on the outside have less value.

George Kettler
o 70 Elky 496 build with #074 AL heads is done race weight should be 3895# with the AL heads and the thinner front race rubber. New combo, no times
o 68 Vette 427/M-20/3.36 23 year owner
http://public.fotki.com/kettbo/gearhead/
o 68 Camaro Vert 327 project, painted, assembly stage http://www.camaros.net/forums/showth...183654&page=55
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post #12 of 16 (permalink) Old Mar 14th, 09, 3:03 PM
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Re: Aluminum heads 3946074

I bought a set of these heads on e-bay a few years ago.
But I only have one good one. After I recieved them, I came to find out that someone had milled about .187 off the deck of one.
Seller dissapeared............

So I now have one good bare casting. If you hear of anybody needing one (and a paper wieght) let them know.
I'll hang on to it until someone needs it.

"It is when people forget God that tyrants forge their chains." -Patrick Henry
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post #13 of 16 (permalink) Old Mar 17th, 09, 10:08 PM
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Dana
 
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Re: Aluminum heads 3946074

I could use a good paperweight!
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post #14 of 16 (permalink) Old Mar 17th, 09, 10:16 PM
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Re: Aluminum heads 3946074

Quote:
Originally Posted by Dana
I could use a good paperweight!
So could I but I really didn't expect a $750 one.
Needless to say, that was and is the last time I buy something without seeing it in person.

"It is when people forget God that tyrants forge their chains." -Patrick Henry
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post #15 of 16 (permalink) Old Mar 28th, 09, 7:16 AM
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Brian
 
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Re: Aluminum heads 3946074

Quote:
Originally Posted by kettbo View Post
I'm afraid those guys who would pay big bucks for virgin sets will pay far less for modified/repaired heads. Even heads that have mods not showing on the outside have less value.
This is true. I don't have that much in them, so they are a nice converstaion piece. Like when standing around the garage with a few friends and a cold cooler!
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