The Comp Cams Ultra ARC Aluminum Series Rocker Arms increase engine power improve valvetrain stability and enhance oiling efficiency. Their extruded design—developed using FEA analysis—creates a stronger stiffer rocker body without adding unnecessary weight. The ARC series rocker arms feature an Arced Recessed Contoured design delivers an optimal strength-to-weight ratio. Backed by a Lifetime Warranty—buy them once and use them forever. Engineered for applications running up to 700 lbs of open spring pressure.