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Old 04-15-2004, 07:03 AM
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BBC head chamber volume and other questions

Hi all! I wanted to see if anyone could tell me what the chamber volume is on a big block chevy 6272292 head. I disassembled my 72 402 last night, and I see that the pistons have a dome, probably 1/8 to 1/4 inch, with a partial relief for the intake valve.

Being that this is a 72 truck motor, with a listed compression of 8.5:1, I expected to see dished pistons, but I suspect that these heads have a rather large chamber volume to bring the squeeze down.

All Mortec or any of the other decoding sites I know says is that the heads have "open" chambers. I'm just trying to figure out what that means.

I have not decided if this motor is going in the Camaro or not, but if it stays I'm trying to decide if I can build it with the parts I have, or whether I need to get different heads or pistons. I want to run pump gas, so maybe this setup is okay. When I saw the factory ratings of 210 HP, 325 ft. lbs., I figured this motor wasn't worth having. But then I remembered that 1972 or thereabouts was the switch from SAE Gross to SAE Net, so maybe this old 402 isn't such a bad starting point.

The bores are calipering as standard, 4.125", and there is only a tiny ridge at the top, so I may be able to get away with a hone job and reusing the pistons. That's why I am asking about the heads, and whether I should try to keep them.


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Old 04-15-2004, 07:39 AM
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Should be around 119cc. Generally they run big, around 123cc if they are un milled. Do not take this as the gospel. Unless you CC the head, this is just a good educated guess.

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