Excellent condition Quarter Master Racing 153 tooth flywheel with excellent teeth – new inventory that was never ran but has been in storage for over 20 years – never installed – appears to be an older version of Quarter Master Racing P/N 509107 / 509107R – fits most 7.25” standard 6 bolt clutches including Tilton, Quarter Master and AP Racing – weighs only 7.7 lbs – fits 1985 and older small block Chevy SBC – former parts inventory removed from a former professional team long ago