What year heads are part # 10128374
07-29-2004, 05:30 PM
#1
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What year heads are part # 10128374
I'm trying to find out as much about my car as I can. Thats the part # off the heads under the valve cover, so I'm trying to figure out if its a self port job, or the guy sent in the heads to get ported and got a different year back.
07-29-2004, 08:16 PM
#2
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Re: What year heads are part # 10128374
Thats a common # for LT1.....
350 ALUMINUM HEADS - There were two versions of the aluminum heads used on the Corvettes, Camaros and Firebirds. The later ones have less material around the top of the intake ports and weigh about 2- 1/2 lbs. less than the earlier ones, but they are identical otherwise. Look for a 10128374 and possibly a 649.
350 ALUMINUM HEADS - There were two versions of the aluminum heads used on the Corvettes, Camaros and Firebirds. The later ones have less material around the top of the intake ports and weigh about 2- 1/2 lbs. less than the earlier ones, but they are identical otherwise. Look for a 10128374 and possibly a 649.
07-29-2004, 09:30 PM
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Re: What year heads are part # 10128374
This is all I found... Scroll down... 
with 3 casting # s'
92-up 10128374
93 10205245
94-96 10207643
http://www.mortec.com/castnum.htm
with 3 casting # s'92-up 10128374
93 10205245
94-96 10207643
http://www.mortec.com/castnum.htm
07-30-2004, 09:08 PM
#5
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Re: What year heads are part # 10128374
The #374 was introduced in '92. The 374s were used in '93? I am also aware, GM introduced another casting # in '93 (see above). So, your guess is almost as good as mine. I am aware of a total of 4 castings #s through '97. Let's not forget the notorious #561 castings. So basically.......I agree with above post.
So basically.......I agree with above post.
Last edited by arnie; 07-30-2004 at 09:26 PM.
08-01-2004, 12:46 PM
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Re: What year heads are part # 10128374
I agree with Arnie, and a great deal of the heads we've had that supposedly came off of 97's were 561's. Probably 90% of the castings we see are the 643's. I still havent come across a ruined '374' head yet, but if I ever do I'll section it to see if there's any truth to the rumors.
Those may have been original, as I've seen 374's on 94's and supposedly a 95 or two.
For most guys, I wouldnt even worry about what casting you have, because even the worst casting is capable of safely flowing more than most shops are likely to get out of them.
Hope that helps a bit
-Phil
Those may have been original, as I've seen 374's on 94's and supposedly a 95 or two.
For most guys, I wouldnt even worry about what casting you have, because even the worst casting is capable of safely flowing more than most shops are likely to get out of them.
Hope that helps a bit
-Phil
08-01-2004, 02:46 PM
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Re: What year heads are part # 10128374
Originally Posted by Ai
I agree with Arnie....Those may have been original, as I've seen 374's on 94's and supposedly a 95 or two.
-Phil
-Phil
I got news for you, fella. I agree with you more than I let on. I'd don't like the idea, of info of this nature geting out, so I should delete this post shortly. Would kinda ruin some of the drama on this forum.
08-01-2004, 02:53 PM
#9
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Re: What year heads are part # 10128374
LOL, no I agree with you, it's highly unlikely, but I've learned to just present what I've seen & let people draw their own conclusions. Lest they revolt against you for telling them the truth, as it's rarely what people want to hear 
What is the world coming to?
What is the world coming to?
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