If you're tracking a street GT3 hard and often I would do a leakdown test etc after 80 hours of track time as well. The track is a lot harder on your engine!

As for differences, I'm not an expert on Cup cars but there is no vario-cam on cup cars or RSRs just regular old cams. Rods are Ti. Rings start to leak when the engine only lives between 6000-9000rpm. Piston pins in the 996/997 cup engines (and maybe the 991) are known to fail after a lot of use. 


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Past-President, Porsche Club of America - Upper Canada Region