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Old 04-18-2004, 06:01 AM
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'76 400 SBC cracked heads

Hi All,

I have recently installed a 400 SBC into my 87 Camaro. The motor has several mods, to name a few bored 30 over and an edelbrock performer rpm intake. After running it a couple of times, I changed the oil and it was gray and milky, looked like water contamination. I pulled the heads off and sure enough there were several cracks in the heads.


I have the original 305 that was in the car. My question is if 87 Heads will match up to a 76 block. I know that the intake will need modification to bolt to the heads but do all the water passages line up? are there any other issues?T he 87 heads will need to be rebuilt. I was just wanteing to make sure the heads will bolt on before I go spending money.

Thanks alot for the help.

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Old 04-18-2004, 07:39 AM
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Most of the time you can have the cracks pinned. we've ran a couple circle track engines like that and never had any problems.

The 87 heads would have to have the steam holes drilled in them if you're running it on the street.Other than that and the intake modifications they will work. You might have some problems bolting the passengers side manifold/header on due to the extra bolt hole on the later head.
I wouln't run 305 heads on anything larger than a 4" bore though.
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Old 04-18-2004, 10:28 AM
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You would be much better getting a set of 350 Chevy heads and having them rebuilt and drilled for 400. The 305 heads are not good on a 4"+ bore motor.
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Old 04-18-2004, 11:58 AM
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Quote:
You would be much better getting a set of 350 Chevy heads and having them rebuilt and drilled for 400. The 305 heads are not good on a 4"+ bore motor.
Agreed as 350 heads are plentiful and parts cheap. As a 400 owner my self I'm looking now for a set of heads I can have gone through and have at the ready for my rebuild.

A related question tough the other day I saw a intake for a 400 that had had been drilled and 2 water hoses run from front to the back steam holes. I heard this was a circle track trick. My buddy told me it's supposed to help with cooing on the 400 heads. Is that something I should look into for doing while I have my intake off?

Regards
Mark
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Old 04-19-2004, 06:31 AM
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Thanks for all the advice I shouldn't have a problem tracking down 350 heads.

Where is this steam hole located that needs to be drilled? Is this just something that is in 400 motors or is it in a certain range of years?
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Old 04-19-2004, 12:01 PM
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Just take em to a machine shop and tell them you need them drilled for a 400 block, if you go to deep you'll be buying new heads. I don't think the year is critical

Regards
Mark
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