JE 194881 Chevrolet small block LS1 forged flat top pistons with a .005 over size for a 3.905 bore size. Provides 383 cubic inches displacement. Works with a stroke of 4.000 and the rod length of 6.200". Dome volume is -.2cc. Each piston weights in at 390 grams. CNC machined ring grooves accept 1/16, 1/16, and 3/16 rings.Includes wrist pins that measure .927 by 2.750 by 150 wall thickness. Double spiro locks are also included. Ideal for oval track, street and street strip performance applications.