Quite a few variables but generally you can mill .020 and not have to do anything. Milling it more and you usually have to grind some on the intake manifold bolt holes. Milling .050 might be okay with just grinding on the bolt holes. You can get an idea by mock assembling the heads without head gaskets (they're usually .040) and test fitting the intake manifold with its gaskets in place.
Last edited by PAUL K; 10-27-2019 at 08:47 AM.
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