In racing, the valvetrain is one of the most highly stressed engine systems. High valve lift, high engine speed, and high spring pressures exponentially increase their demands on the lifters, pushrods ...

Jesel's New Sportman Series Shaft-Mount Roller Rockers Bring Bulletproof Racing Technology To The Bolt-On Street Car Ranks Shaft-mounted rocker arms are usually reserved for the high-stress ...

The rocker arm employs the use of a fulcrum or pivot to increase the cam lift by a given ratio. That increase in lift is the result of moving the pushrod pivot point closer to the fulcrum. That ...