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Aluminium Roller Rocker Set 1.6 Ratio (3/8" Stud Mount) PR66915 Product:Suit SB Chev Vortec With Self Alighning Rocker but they virtually can't breakAluminium Roller Rocker Set 1. 6 Ratio (3 8" Stud Mount)Suit SB Chev Vortec With Self Alighning Rocker PR66915 66915 Fits Chevy small block engines w center hold down valve covers. Rid your engine of internal friction with roller tipped rocker arms. The race proven full needle bearing, fulcrum and roller tip not only unleash horsepower, they also lengthen valve train component life and reduce wear and tear on valve stem tips. Precision machined to