Flexplate Xtreme Duty SFI GM LS Series

The Flexplate Xtreme Duty SFI GM LS Series is a high-performance flexplate engineered for LS-platform engine builds that demand maximum durability and reliability. This component serves as the critical interface between your engine and transmission, designed specifically for builders and enthusiasts running LS engines in street, strip, and high-boost applications. The SFI 29.1 certification ensures this flexplate meets sanctioning body safety standards, making it a trusted choice for serious performance builds where component failure is not an option.

Manufactured by PRW Industries, a recognized leader in rotating assembly components, this flexplate features 168 teeth for optimal starter engagement and is constructed from robust steel to withstand extreme torque loads and thermal stress. The internal balance design integrates seamlessly with internally balanced LS crankshafts, eliminating the need for external balancing weights and simplifying installation. At 6.91 lbs, the flexplate's weight distribution is optimized to reduce parasitic losses while maintaining the structural integrity required for forced-induction and nitrous oxide applications common in modern LS tuning.

Builders installing this Flexplate Xtreme Duty SFI GM LS Series should verify compatibility with their specific LS engine variant and transmission combination before purchasing. The internal balance specification requires a matching internally balanced crankshaft; external balance builds require a different flexplate design. Installation is straightforward for those familiar with engine assembly, though professional machine shop installation is recommended to ensure proper torque specifications and alignment critical to long-term durability in high-performance applications.