Re: head mods ??????
Assuming you are seeking to raise cylinder pressure, the accepted method is to have the
heads resurfaced a reasonable amount. Then, place modeling clay in the area above the valves, put on the head gasket, secure the head to the block and turn the engine over.
Remove the head and determine if the piston and valves have acceptable clearance. Modifying the combustion chamber is not a good idea as the conformation alteration can affect the combustion pattern, and risks breaching the coolant part of the head.
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