Flywheel Bert /Brinn 91t Chevy w/coupler 1pc Stl

The Quarter Master Flywheel Bert/Brinn 91-Tooth Chevy with Coupler (1-Piece Steel, Part #509139B) is a purpose-built flywheel engineered for high-performance Chevrolet engine conversions and clutchless bellhousing applications. This internally balanced, single-piece steel design delivers the rotational mass and tooth engagement needed for reliable power transfer in custom drivetrains where OEM components fall short.

At 91 teeth, this flywheel matches the geometry and engagement profile required for Quarter Master's clutchless bellhousing kits, which eliminate conventional clutch assemblies and shift dramatically faster than traditional manual transmissions. The internal balance specification ensures smooth operation at sustained high RPM without vibration or imbalance issues that plague improperly weighted flywheels. Constructed from steel rather than aluminum, this component handles the thermal and mechanical stress of repeated engagement cycles, rapid shifts, and high-load launches without warping or premature wear. The 2-piece seal design protects internal drivetrain components from contamination while accommodating the unique mounting requirements of these specialized applications.

This flywheel is designed for builders and racers implementing advanced transmission systems in Chevrolet-powered vehicles—particularly those pursuing quarter-mile performance, bracket racing, or high-horsepower street applications where shift speed and engagement consistency are non-negotiable. It solves the fitment gap that emerges when combining modern performance gearboxes with classic or heavily modified Chevy engine platforms. Weighing 5.65 pounds and dimensioned at 9.45 × 3.5 × 11 inches, it integrates directly into existing bellhousing packages without modification when paired with compatible Quarter Master components.