SFI-18.1 Harmonic Balancer

It meets SFI-18.1 standards and has undergone rigorous spin-testing up to 12,500 rpm, ensuring its durability under high-stress conditions. The damper is constructed from durable carbon steel with an injection-molded and bonded elastomer for optimal performance and longevity. Key features include easy-to-read engraved timing marks for precise engine tuning and a highly polished, baked-enamel finish that provides a professional look. This balancer is designed with an internal engine balance and boasts a 25 percent underdrive integral harmonic damper and crank pulley design. An alternator pulley is included, and the damper is specifically designed to fit long spacing pulley kits, making it a suitable upgrade for many LS-based GM Truck and SUV engines, including those with 4.8L, 5.3L, and 6.0L displacements. Installation of this harmonic balancer requires additional components. It necessitates the purchase of NAL-12557840 and a new belt, as it integrates a 25% under-drive design. Mounting hardware is not included with this damper. The manufacturer's part number is SUM-C2520.