This Exclusive kit from MMR features ARP 2000 Headstuds, Nuts, Washers and Assembly Lube for a simple installation! If you are building a serious GT500 you must have this kit. Factory Bolts are not re-usable! Available only From MMR *Genuine ARP 2000 220,000 psi Tensile Strength (not cheap 190,000psi) *For use with all GT500 Engine Blocks *Works with all Coyote, GT350, GT500 and Boss cylinder heads