SCE Pro Copper head gaskets are softer than other gaskets for an accurate seal.
SCE Pro Copper head gaskets are CNC-fabricated and then annealed for outstanding malleability. SCE Pro Copper head gaskets are rated 10 Rockwell F scale points softer than other gaskets for an accurate seal and have a tensile strength of 32,000 psi to handle high-horsepower applications. SCE even claims that you can reuse a set of SCE Pro Copper head gaskets up to five times after cleaning them with a common solvent.

Head Gaskets, Copper, 4.630 in. Bore, .043 in. Compressed Thickness, Chevy, Big Block, Pair