Flywheel SBC External Balance 87-up

The Flywheel SBC External Balance 87-up from ACE Racing Clutches is a purpose-built external balance flywheel engineered for small block Chevy engines requiring dynamic balancing correction. This 153-tooth iron flywheel is essential for builders and enthusiasts modifying 1987 and newer SBC applications where external balance weights are integrated into the rotating assembly. External balance flywheels are critical when pairing your SBC with external balance crankshafts or when your engine has been rebalanced to external specifications, ensuring smooth operation and eliminating vibration that would otherwise damage engine mounts and drivetrain components.

Manufactured from ductile iron, this external balance flywheel weighs 17.94 pounds and features the standard 153-tooth ring gear for reliable starter engagement across virtually all SBC applications. The external balance design incorporates weight distribution that matches OEM or custom external balance crankshaft specifications, allowing the entire rotating assembly to achieve perfect dynamic balance without internal counterweight modifications. The natural iron finish resists corrosion during engine assembly and break-in, while the solid construction handles sustained high-RPM operation and repeated clutch engagement cycles typical of performance driving and racing environments.

This flywheel is ideal for street and competition small block Chevy builds from 1987 onward, particularly when upgrading to aftermarket external balance crankshafts or completing a full rotating assembly rebalance. Installation requires proper flywheel balancing verification and alignment with your specific crankshaft's balance specification—working with an experienced machine shop or balancer is strongly recommended to confirm weight compatibility. ACE Racing Clutches' external balance specification ensures seamless integration with matching clutch assemblies and transmission bell housings, making this flywheel a reliable foundation for any serious SBC performance or restoration project.