This listing is for a new set (8) of Speed Pro Hypereutectic Chevy 383 stroker pistons - H635CP. +30 bore (4.030" Bore) 350 with 3.75" stroke crankshaft. Dome piston with 2 valve reliefs. Anti-friction coated skirts. For use with 5.7" connecting rods. Includes pins and wire locks. Can be used with either pressed fit or bushed rods.Pistons are .200" Dome with 2 Valve Relief, Press-Fit or Floating .927" Pins, 5/64" x 5/64" x 3/16" ring package. Rings included are either Hastings or Mahle/Perfect Circle depending on availability at time of purchase.