Finally a quality built Aluminum flywheel that will greatly improve the revving potential of your car! Don't use home made machined stock flywheels, they can stress crack caused by engine revs, heat and clutch abuse, may well have pushed your stock lightened flywheel into an unsafe condition. Flywheels and clutches have been known to fail catastrophically. Use only Flywheels that are designed to be lightweight, ours only weigh 13.75 lbs! The Flywheel is drilled for the 10 inch and the 9.5 inch clutch.