SFI Flexplate GM LS9 Engine

The SFI Flexplate GM LS9 Engine is a precision-engineered flexplate designed for high-performance LS-series engine swaps and racing applications. Built to SFI 29.1 certification standards, this flexplate bridges your engine's crankshaft to your transmission's torque converter with absolute reliability under extreme loads. Whether you're building a street-strip machine, a dedicated track car, or upgrading an existing LS platform, this flexplate ensures your drivetrain components remain harmoniously synchronized through hard acceleration and sustained power delivery.

This SFI Flexplate GM LS9 Engine features a 168-tooth ring gear geometry and internal balance design, making it compatible with factory LS9 crankshafts and equivalent internally-balanced assemblies. The steel construction provides the rigidity necessary to transmit power without flex-induced vibration or harmonic issues that compromise drivability and component longevity. SFI certification guarantees this flexplate meets safety standards for both street and competition use, ensuring the component won't scatter or fail catastrophically under race-level torque. At 9.85 lbs, the weight is engineered for optimal balance without sacrificing strength or durability in high-rpm environments.

This flexplate is essential for anyone completing an LS engine swap into a vehicle with an automatic transmission, or for builders transitioning between different LS variants with internally-balanced crankshafts. Engine builders, performance shops, and DIY enthusiasts who demand reliability during dyno testing, street driving, or road racing applications will appreciate the SFI certification and proven design. Direct fitment with GM LS-series platforms and compatibility with standard torque converter bolt patterns make installation straightforward for experienced mechanics. Verify your crankshaft balancing specification before purchase to ensure seamless integration with your specific engine platform.