This listing is for (8) Hyper-eutectic pistons and a matching moly ring set in your choice of sizes compatible with 1968-85 Chevrolet small block 350 engines using a 400 crankshaft. This makes a 383 cubic inch engine. For use with a 3.750" stroke and with 5.700" inch rod length. Pistons are flat top 2 valve reliefs with coated sjirts. Rings are 5/64" 5/64" 3/16" ring grooves .927" pin diameter - pins included. For use with 5.700" length rods. Can be Press-fit or floating pins. Locks rings included. 1.425" Compression Distance..