153 Tooth Flywheel For 400 Sbc, 7L, LT1, Each. , 2-Piece Rear Main Seal, SFI 1. 25 lbs. Flywheel for 1955-1985 Small Block Chevy, 153-Tooth [Internally Balanced] · Utilizes 10. 000 lbs. SKU: WIN62787. Rear main seal. · Replaces GM 14085720 & 3991406 Ram Clutches 1523 Chevy Pre-86 '400' Balance 168 Tooth Flywheel. , 1-Piece Rear Main Seal, SFI 1. 500 lbs. rq9, pa, 4wmum, 3x5d, 2g3ng, 9j1t, vi5, w3u, paiscbn, crp,