Competition Cams 190021 3/8" SBC Rocker Arm Reviewhttp://tinyurl.com/p5o546h Competition Cams 190021 3/8" SBC Rocker Arm For small block Chevy applications with 3/8 inch studs, 1.6 RatioDesigned for high performance street and race enginesPrecision-sorted trunion bearings withstand elevated valve spring pressure and valve liftAdditional clearance, up to 1.650 inch O.D. valve spring
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