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Found this post at another board concerning the 2.2 engine: According to the 1997 Technical Referance Booklet; "Compression has been increased to 9.7/1 by reshaping the crown of the piston. THIS ELIMINATES THE CLEARANCE THAT WAS AVAILABLE BETWEEN THE PISTON AT T.D.C. AND A FULLY OPEN VALVE" Don't know if this is correct but maybe the reason I bent my valves when Idle pully came apart.

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