The lightest rocker arm available, but still has superior strength characteristics due to its design The strength of 660 bronze bushings and bearing-grade steel for the roller tip Extensively tested under extreme conditions to ensure durability in your engine Will accept cams with up to .700" lift at a ratio of 1.625 (stock) Made in the U.S.A. Twin Cam rocker boxes may need to be clearanced.. RCKR ARMS 84-17TC 86-19XL
