The Edelbrock Cylinder Head Gaskets feature a tough, scuff resistant silicone rubber coating and do not require the engine to be warmed in order to seal. The Edelbrock head gaskets will work with stock cast iron, aluminum and ultra light performance aluminum blocks and heads. The intake, exhaust, head, water neck, distributor, and valve cover gaskets are all included. They are sold in a package of 2 gaskets.