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Ultra ARC Aluminum Series Rocker Arm for Ford FE Big Block 3/8-24 Adjuster Screw Ultra ARC Aluminum Series Rocker Arm for Ford FE Big Block 3/8-24 Adjuster Screw. The Comp Cams Ultra ARC Aluminum Series Rocker Arms increase engine power improve valvetrain stability and enhance oiling efficiency. Their extruded designâ??developed using FEA analysisâ??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.