This connecting rod set (consist of 4 connection rods) is designed for use with racing piston (P/N 88958635) and billet crankshaft (P/N 88958620). These rods are billet machined from 4350 steel. Length is 5.888 inches. Rod bearing diameter is 1.888 inches. Floating piston pin diameter is .829 inches. For single service rod use P/N 88958649.