kb pistons
just make sure you have 6.5 times the bore as your top ring gap And the skirt to cylnder wall clearance must be titer than normal cast or forged pistons to prevent rocking. All the heat is kept on the top of the piston. They will work to 7200 no problem but must be set up properly. cyclnder must be honed to the piston clearnce recommeded by kb and ring gap filled to there spec.or ring end gaps will but an pop the top ring land