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Flycutting the heads as a means of increasing compression ratio makes the engine narrower, which will require the chain boxes to be machined an equal amount, and eventually cause you to need larger chain idler sprockets. But it is really not recommended because it reduces piston-to-head clearance.
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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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