PRW Flywheels are race ready and S.F.I approved. They have been precision balanced to exact tolerances and feature CNC Machined ring gears for superior wear resistance against the worst of racing racing conditions. # Features: Fits SB Chevy Engines # 2 piece rear main seal crankshafts # 153 tooth count # No Weight - Internal Balance # Current, up to date S.F.I. 1.1 approval sticker NOTE: Weighs 18lbs and is not for use with stock clutch. Must use 10 1/2" Ram Clutch and Pressure Plate # 605-301M or 605-1021 only.
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