Billet Steel Flywheel SFI GM 5.7L LS1-LS6

The PRW Industries Billet Steel Flywheel SFI GM 5.7L LS1-LS6 is a premium performance component engineered for high-output LS-series engine builds. This billet steel flywheel delivers the durability and balance precision demanded by serious enthusiasts, drag racers, and street performance builders who rely on SFI-certified components for critical engine internals.

Featuring a 168-tooth ring gear configuration designed for LS-series compatibility, the flywheel meets SFI 1.1 safety certification standards—a critical requirement for vehicles operated at high RPM or in competition environments. The internal balance design integrates counterweights directly into the billet steel construction, eliminating separate balance bob hardware and reducing the risk of component separation under extreme acceleration. The 1-piece seal interface ensures leak-free operation across extended duty cycles. At 24.45 lbs, this flywheel delivers the rotational inertia characteristics LS builders expect while maintaining the structural integrity required for naturally aspirated and forced-induction applications.

This component is purpose-built for LS1 and LS6 platform users—specifically those upgrading from cast-iron OEM flywheels to gain improved reliability, tighter manufacturing tolerances, and SFI certification compliance. Whether supporting a street-driven 5.7L or a purpose-built race engine, billet steel construction resists cracking under sustained high-load cycles and thermal stress that would compromise cast alternatives. The 168-tooth design maintains factory starter compatibility while supporting performance clutch systems.

LS-series flywheels are core to engine performance and reliability—the interface between crank and drivetrain must perform without compromise. SFI certification on this billet steel unit signals that PRW Industries has submitted to independent safety testing, a standard serious builders reference when sourcing internal engine hardware.