Quote:
Originally Posted by PeteKz
Thicker equals worse combustion chamber squish and less efficient burn.
That said, the important number is the clearance between the piston and the head. Use base shims to get that in the right range. I'm a minority, but I want as tight a clearance as I can get without contact. Generally around .030"/.75mm. It takes a lot of test assembling and measuring to get that accurately, so engine builders will not do that unless you specify it.
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I had my heads cut and ran the original thickness and it appeared the pistons may have been touching the heads.
During refresh, I ran thicker and reduced squish. I swear squish made better performance everywhere.