The HP shim technology increases clampload around the combustion chamber, thereby increasing the sealability of the head gasket around the open deck block.

This Part Fits:

Year	Make	Model	Submodel
2011-2016	Ford	F-150	XL
1949-1954	Jaguar	XK120	Base
1952-1954	Jaguar	XK120	M
1955-1957	Jaguar	XK140	Base
1955-1957	Jaguar	XK140	M
1955-1957	Jaguar	XK140	MC
1958-1961	Jaguar	XK150	Base
1958-1961	Jaguar	XK150	S