CHEV BBC 427 / 454 / 502 FEL-PRO HEAD GASKET .# 1047 Fel-Pro performance head gaskets are head gaskets that seal. Fel-Pro performance head gaskets feature a PermaTorque/blue gasket body with a solid-steel core to minimize torque loss and gasket blowout. Fel-Pro performance head gaskets also have a wire-ring combustion seat with stainless steel "armor" for extra sealing force around combustion chambers. Made with a pre-flattened steel-wire ring, Fel-Pro performance head gaskets have the strength of steel-wire sealing and the minimum brinelling of aluminum heads. Bore (in) 4.540 in. Bore (mm) 115.316mm Gasket Material Stainless steel core laminate Compressed Thickness (in) 0.039 in. Compressed Volume (cc) 10.500cc Lock Wire No Quantity Sold individually. Notes Pre-flattened steel wire. Fits all series blocks. Also suitable for marine applications.