Billet Flexplate SFI LS/LSX 168-Tooth 8-Bolt

The Billet Flexplate SFI LS/LSX 168-Tooth 8-Bolt by ProTorque is engineered for serious LS and LSX engine builders and performance enthusiasts upgrading to automatic transmission combinations. This component serves as the critical interface between your crankshaft and torque converter, transferring engine power while accommodating the flex necessary for smooth torque converter engagement. Whether you're building a stock-appearing restomod, a high-horsepower street engine, or a dedicated drag racing platform, a quality billet flexplate is non-negotiable for reliability and longevity.

ProTorque's billet construction delivers superior strength and damping characteristics compared to stamped steel alternatives, with precision machining throughout to ensure perfect runout and balanced operation at any RPM. The 168-tooth design provides precise starter engagement and is standard for LS and LSX applications with conventional automatic transmissions. The 8-bolt pattern ensures secure mounting to your LS crankshaft, while SFI certification guarantees the component meets sanctioning body safety standards for competition use. Billet material resists fatigue cracking under sustained high-load conditions and maintains dimensional stability through thermal cycling, critical advantages when running boost, nitrous, or extended engine duty cycles.

This flexplate is ideal for LS engine swaps into classic muscle cars, modern performance builds, and dedicated race engines paired with TH400, 4L60E, 4L80E, or other LS-compatible automatics. Installation requires proper balancing with your specific torque converter and crankshaft assembly—work with a qualified machine shop if you're unfamiliar with flexplate and converter dynamics. The 9-pound component balances ease of handling with the mass and rigidity necessary for dependable power transfer, making it a practical choice for daily drivers and weekend warriors alike.