Piston - FHR - 3.780 in Bore - 1.5 x 1.5 x 3.0 mm Ring Grooves - Minus 2.9 cc - GM LS-Series - Set of 8

Piston - Professional Series - Forged - 3.800 in Bore - 1/16 x 1/16 x 3.0 mm Ring Grooves - Minus 2.20 cc - GM LS-Series - Each

Piston - Premium Forged - Forged - 4.000 in Bore - 1.2 x 1.2 x 3.0 mm Ring Groove - Minus 12.50 cc - GM LS-Series - Set of 8

Piston - Premium Forged - Forged - 4.030 in Bore - 1.2 x 1.2 x 3.0 mm Ring Groove - Minus 12.50 cc - GM LS-Series - Set of 8

Piston and Ring - Premium Forged - Forged - 4.005 in Bore - 1.2 x 1.2 x 3.0 mm Ring Groove - Minus 20.00 cc - GM LS-Series - Kit

Piston and Ring - Premium Forged - Forged - 4.010 in Bore - 1.2 x 1.2 x 3.0 mm Ring Groove - Minus 8.00 cc - GM LS-Series - Kit