GAH-SK6A premium valve cover gasket made with high temperature silicone. This gasket fits the OEM stock stamped steel valve cover used on all big Healey 6 engines including the 100-6.  This gasket has been designed with a semi-circular cross section to better fit these valve covers. The flat side of the gasket mates to the cylinder head while the curved semi-circular side mates to the recess in the valve cover to eliminate leaks.