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You have to know the combustion chamber size-- if the heads were decked/shaved the combustion chamber will be smaller than stock, meaning your compression will be higher with the same pistons-- the engine will also be narrower, which means you could have chain issues.
Years ago (10) I posted photos of how to do this with a glass burrette.
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'66 911 #304065 Irischgruen
‘96 993 Carrera 2 Polarsilber
'81 R65
Ex-'71 911 PCA C-Stock Club Racer #806 (Sold 5/15/13)
Ex-'88 Carrera (Sold 3/29/02)
Ex-'91 Carrera 2 Cabriolet (Sold 8/20/04)
Ex-'89 944 Turbo S (Sold 8/21/20)
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