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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,604
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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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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners.
Cars are for driving. If you want art, get something you can hang on the wall!
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