The Speedmaster PCE291.1082 is a 6.780-inch harmonic balancer damper designed for Chevy GM LS engines, featuring a 10% underdrive pulley ratio that reduces parasitic drag on engine accessories to help free up more power to the wheels. This unit meets SFI 18.1 certification standards, making it suitable for sanctioned racing and performance applications where safety-rated dampers are required.
Built as a direct upgrade over the factory harmonic balancer, this underdrive damper helps protect your LS engine's crankshaft from torsional vibration while simultaneously improving overall performance efficiency. Whether you're building a dedicated track car or a high-performance street machine, the Speedmaster PCE291.1082 delivers the reliability and compliance needed for serious GM LS-based builds.
