Chevy SBC 350 358 Flat Top Pistons + Moly Rings Kit Sealed Power H631CP Hypereutectic Pistons & Rings Kit (4.030" bore) Click ON CORRECT OVER SIZE NEEDED BEFORE PLACING IN CART Comp Ratio: 10.41:1 w/58cc Heads, 8.63:1 w/76cc Heads 5/64'', 5/64'', 3/16'' Chrome-Moly Rings