The world’s top engine builders have chosen this spring kit for over 20 years when refreshing these BMW cylinder heads. The dual spring in this kit has been designed to allow for additional valve lift over OEM. They are wound from super clean chrome silicon wire that has been heat treated and shot peened, which exceeds OEM specifications. The FEA designed titanium retainers and heat treated steel basewashers offer optimal fitment, keeping lateral movement to a minimum. This kit works together as a system providing long service life.
