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High Energy Aluminum 1.6 Ratio Roller Rocker Set of 8 AMC SBF Olds 7/16" Stud These High Energyââ??¢ Die Cast Aluminum Roller Rocker Arms for AMC V8 290-401 Ford V8 289 302-351W and Oldsmobile V8 350-455 Applications are perfect for street and moderate Race use. With a 7/16" Stud diameter and 1.6 ratio the die cast larger-than-stock body of the Rocker arms is made of aluminum for superior strength with light overall weight. High Energy Die Cast Aluminum Roller Rocker Arms from COMP Cams are an affordable option that feature a die cast aluminum body with a needle bearing fulcrum and Roller tip. Designed to be stiffer and more durable these cost effective Rocker arms are capable of providing added valve lift while withstanding the rigors of a performance application. Their specially engineered fulcrum and Roller tip create far less friction than sliding factory models to lower oil temperatures thus improving both response and horsepower. Snap rings are used to hold the trunnion and bearings locked in place.Cost effective aluminum construction provides superior strength to weight ratioNeedle bearing fulcrum and Roller tip reduce friction and lower oil temperatures for improved response and horsepowerDurable design increases valve lift while withstanding the rigors of moderate Race useFor use with up to 550 lbs of open spring pressure