CP Pistons brand Harley Twin Cam 98ci forged piston kit. For use in street; high performance and racing engines; for use with a 3.937 in. 98ci crankshaft stroke of 4.000 in. 10.25-1 compression; kit includes 1 piston; 1 piston pin; piston rings and pin lock rings. Order a quantity of 2 for complete engine rebuild.