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PCA Member since 1988
Join Date: Feb 2018
Location: SW Washington State
Posts: 4,575
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Before I did the clay or solder test, I loosely assembled the cylinder to the head, and pushed the piston down in (without rings) so see where it contacted the inside of the head. I rocked it around a little bit to see the witness marks. When I test assembled the engine, I put the solder at that point. That contact point was about the middle of the back side of the dome of my Mahle Sport 3.0/3.2 "10:1" pistons. I ended up with a bit more than .030"/.75mm of clearance between the pistons and inside of the head, without the .25mm copper base gaskets. I try to keep the squish clearances tight.
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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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