I've been studying older post about head milling and boosting compression, and I still can't find a honest answer, as well as all the answers are different for the same question. I know I need to know how far down in the hole I am [I don't]. As far as I know, Im still running a stock motor and Im porting a head for better flow, and want to boost compression as well. I know stock cc #s are about 54 cc's and/or higher.
To make myself safe for when rebuild day comes, Im thinking on keeping the mill conservative in case the pistons push up higher than stock, [which I will doubt!].
My questions are these----
1. Would a .50 mill be a good conservative mill to help boost compression some? Looking for a close to 9.0-1!
2. Looking a keeping a composite head gasket for sealing reasons, who makes the thinest one to help boost/keep the compression up without spending a arm and leg?

I think you mean 0.050". I took 0.100" off or mine and the cylinder pressures range from 155-165 psi. I have to run 92-93octane to keep from pinging.
If you use a composite head gasket you reduce the ammount you have milled because the gasket is thicker than stock.

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.050 to .075 is a good place to start.

We are basically just taking a "wild guess" because stock Slants are all over the map as far as deck height and head chamber cc's go. You just have to get in there and measure, then "do the math".

As for head gaskets, all of the composit ones are around .045 compressed. The factory steel shim gasket is .020 so .025 of head milling is used making-up that difference.
DD

how far can you mill and keep stock pushrods on a hydraulic liftered late model?

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