PQ Series SFI Billet Steel Flywheel - Chevrolet 265-427 Small Block 1955-85, (Except 400) & Big Block 396-427 & W Block 348-409, 168 Tooth, 2 piece rear seal, Internal Balance. SFI certified; Manufactured from 1045 Billet Steel; CAD Engineering and CNC Machined; Award winning designs year-after-year;