96" Sidewinder® Engine Performance Kit - Natural - 91-7660Kits include standard flywheel assembly, 3 5 8" bore cylinders, 9. 75: 1 pistons, rings and gaskets. Does not include manifold, pushrods, or pushrod clips. Made In the U. S. A.. Cases must be bored to accept 3 5 8" bore cylinders, and a minor crankcase clearancing operation for the crankpin nut must be performed.. 77 89 style pinion gear and oil pump drive gears must be used when installing S&S flywheels in 90 99 engines..