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1972_911T
A perfect cylinder with no wear will have a bore diameter of 84mm for a stock 2.4L engine. As your engine wears, the bore diameter will increase. The wear limit has to do with bore diameter – you are allowed to increase your bore diameter up to 84.8 mm. The ring gap must remain within the tolerances given (0.2 to 0.4mm) regardless of bore diameter.
Rex
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1975 911s
1997 Saab 900s
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