Brand new in the box, DSS Small Block Ford 302 E Series -3cc Flat Top SBF 20 Degree Inline Forged Piston Set 4.030 inch bore Pin Dia.: 0.912" Comp Height: 1.6". Im going a different route with bottom end and need a shorter piston. Pistons are meant to work with a standard 302 stroke crank and rod length, but could be used in other builds if calculated. Use part # 8720-4030 to look up more specs on pistons. Ring pack PART #: RS-MR100-4030. Pistons and rings are $600 new, save some money here for the same setup!SBF, Windsor, 289, 302, 331, 347, AFR, Holley, Edelbrock