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S/T Roller Rocker Set 1.65 Ratio (3/8" Stud Mount) YTST2009 Product:Suit Holden 253-308 Cast iron simply cannot provideS T Roller Rocker Set 1. 65 Ratio (3 8" Stud Mount)Suit Holden 253 308 YTST2009 ST2009 Street Terra Features: Economically priced rocker set for popular applications with strong vacuum die cast arm designed for high performance street and budget race applications with stock or mild camshafts and mildly stronger valve springs. Ultra reliable standard replacement for pressed metal rockers on stock engines. Best quality hardware including oversize ground