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Bob,
"Cylinder outer base diameter to crankcase"
2.0
92.072-92.159mm (checks with spec book p. 27)
2.2 same as 2.0 (checks to spec book p. 39)
2.4 same as 2.0.
It's only when the 2.7 cylinders appeared that the diameter went to 97.072-97.152mm, or a 5mm change, basically.
So it is possible to build a 2,4 on a 2,2 case, I believe the distributor bore is larger on the 2,4 case, which would require the use of a 2,2 distributor.
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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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