− Decrease quantity for Copper Head Gasket, .043C COPPER HEAD, GM CHEVY 18/23 DEG SM BLOCK 4.200-in. BORE Pocketed/No Steam Quantity + Increase quantity for Copper Head Gasket, .043C COPPER HEAD, GM CHEVY 18/23 DEG SM BLOCK 4.200-in. BORE Pocketed/No Steam Add to cart