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What is the most i can shave off the 452's to raise the compression on my 78 440? I know the intake will need milled also but i want to slightly increase the compression without a $500 set of pistons lol

How thick is the stock steel shim headgasket on a 77-78 motor home 440? Im trying to squeeze the compression up a bit and was looking for thinner gaskets to go along with shaving the heads. And does anyone know the stock compression ratio, i come up with about 8:1 but want to double check that...