CNC-machined aluminum flywheels reduce moment of inertia and internal engine stress to increase power. Made from 6061-T6 or 2024-T3 aluminum with a friction surface compatible with organic, Kevlar or sintered iron clutch discs. All are SFI-approved.Pit Stop USA offers Fidanza Engineering Aluminum SFI Flywheel - SB Ford 289-351W - 164 Tooth - External - 13 lbs. - SFI 1.1 Approved 186511 at low everyday prices. Be sure to check out all of our products from Fidanza including Fidanza Aluminum Flywheels.