Ford SB 302 351w 1.6 Ratio 7/16" Ultra Black Chromoly Roller Rocker Arms Set They're machined from billet aluminum

They're machined from billet aluminum for lasting durability and good looks

That latter characteristic translates into increased ground

Speedmaster alternator pulleys are manufactured from quality materials to ensure strength and durability

allowing it to run cooler and quieter than external units

the LS-series heads are produced using our "Gravity Casting" process

Ford SB 302 351w 1.6 Ratio 7/16" Ultra Black Chromoly Roller Rocker Arms Set They're machined from billet aluminumSpeedmaster roller rockers are available in various ratios, so you are good to go. They feature greater strength and durability, capable of withstanding valve spring load.