I have a '77 401 with the 8.25 CR and a set of 502 heads. How much can I mill off the heads to bump up the CR and not have to mill the intake manifold? Thanks.
I have a '77 401 with the 8.25 CR and a set of 502 heads. How much can I mill off the heads to bump up the CR and not have to mill the intake manifold? Thanks.
.023 will give you 1/2 point in compression. You shouldnt need to modify your intake for this. You may need .020 shims under your rocker bridges.
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just a fyi, when you mill the chamber side of a set of heads you usually mill the intake side of the heads, not the intake manifold. This way the heads will work with and stock manifold. Hankrod aka Hackrod Matt
Originally Posted by Henry Lavrenz
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