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I would lean more towards changing pistons than milling your heads, what comp are your shooting for and what kinda heads to you have? You really don't gain much from a slight bump in comp but it is worth while if setting up a combo you know you will be running for a long time.
BTW a thinner head gasket might be a better alternative.
From: All humans are vermin in the eyes of Guru VA
Cruise-In IV Veteran
Cruise-In V Veteran
Re: flat milling heads (Fevre)
Well the heads I have are 76cc heads and I am shooting for 64-58cc. to match the L98 shortblock. the shortblock gives a compression ration of 9.1:1 with 64cc heads.
Pistons cost money. Using my dads milling machine is free.
I emailed the manufacturer, they list the safe amount heads can be milled for all the other heads just not the ones I have. So I should be hearing back from them soon.
you can probably get away with milling 20 or 30 thousands. Too much will make it very difficult to mate up the intake manifold.
There is a trick to angle mill the heads to cut the combustion chamber more to get the compression without totally screwing up the geometry with the intake bolts.