Thread: 327 rebuild

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again, thanks for the wealth of info. last question; How much can I mill the old heads b4 excessive iron taken off weakens them too much?

Originally Posted by ecreek

again, thanks for the wealth of info. last question; How much can I mill the old heads b4 excessive iron taken off weakens them too much?

Most fellows will limit head surfacing to about 0.030" (thirty thousandths of an inch). On a small block Chevy head, each cut of about 0.006" (six thousandths of an inch) represents reducing the chamber volume by one cc.

If this were my build, I would limit cutting the heads to only the amount required to get a good, flat surface on the heads, like maybe 0.005" to 0.010". Do not cut the heads thinking that you will make a race motor. You won't.

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