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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,561
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For the model year 80 the euro 911 had 8.7 cr. The factory used a thinner base gasket on the 8.5 cr US cylinder to raise the compression.
From this view its hard to tell the height of the dome but the 9.3 and 9.8 have a definite peak at the 10 oclock position of the piston.
Bruce
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