Bullet Pistons Piston and Ring - Forged - 4.310 in Bore - 1/16 x 1/16 x 3/16 in Ring Grooves - Plus 24.40 cc - Big Block Chevy - Kit-BBC5110-060-8--Notes: + 24.4cc, 4.250 Stroke, 6.385 Rod Length, 1/16,1/16,3/16 State Restrictions- Canada Restriction-NO -Emission Warnings--NO Truck Freight ---NO