This listing is for a Big Block Chevy Fel-Pro Rebuild Gasket Kit. Complete overhaul gasket kit for '66-'79 Mark IV engines - 396, 402, 427, and 454 engines.Includes high quality gaskets including PermaTorque head gaskets. Great for stock to moderate performance rebuilds.NOTE: There are two series of coolant configurations for the 427 & 454 CID engines. Some blocks have 3 additional coolant holes and requires different head gaskets part number 8523PT. This set contains head gaskets for blocks NOT having extra coolant holes part number 8180PT-2.