SFI Certified Billet Aluminum Flywheel, 6061 T-6, Chevy 1955-85 S/B 262-350 V6/V8, B/B V8 396-427, and 'WB' 348-409, 168T, Internal Balance, CAD-engineered and CNC-machined for precise tolerances and reliability, Recognized for quality, winning Best New Product at the 2006 Hotrod & Restoration Show, Preferred choice of Engine Master Challenge-winning builders for four consecutive years, Rigorously inspected for consistent, top-tier quality and durability in high-horsepower engines.