Upgrade your stock flywheel to a Hays SFI-approved billet steel or aluminum flywheel. Each flywheel is precision machined and engineered to handle extreme duty applications along with being designed to take the punishment of today as high horsepower street, off-road, and race engines. Meets SFI Spec 29.1 For Racing Precision CNC Machined For Maximum Strength/Durability Aluminum Flywheels Feature Forged Steel Ring Gears CAD Designed To Provide Optimum Performance And Reliability Available In Internal/External/Zero Balanced Versions 90 Day Limited Warranty Additional Attributes: GTIN: 00090127744628 Center Bore Diameter: 2.486 in. Engine Balance: External Engine Make/Size: Chevy Small Block Finish: Aluminum Material: Aluminum SFI Certification: 1.1 WARNING CA Proposition 65: No Extened Information: Emissions : Legal US Life Cycle Status: Available To Order Packaging: Quantity of Each: Package UOM: Dimension: 13.2500 x 13.2500 x 1.2500 inches