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	Buick	Regal	CXL
2012-2013	Buick	Regal	GS
2012-2013	Buick	Regal	Premium
2010	Chevrolet	HHR	SS