Mopar BB Flywheel 143 Tooth Int. Balance

The Mopar BB Flywheel 143 Tooth Int. Balance from CENTERFORCE is engineered for serious V8 enthusiasts building or rebuilding high-performance big-block Mopar engines. This internally balanced flywheel is the critical foundation that connects your engine's crankshaft to the transmission, managing rotational mass and engine harmonics with precision. Whether you're assembling a street machine, resto-mod, or track-focused build, an internally balanced flywheel eliminates the need for external counterweights and ensures smooth, vibration-free operation across the entire RPM band.

Constructed from premium steel and rated SFI 1.1 for safety-critical competition use, the Mopar BB Flywheel 143 Tooth Int. Balance features a 143-tooth ring gear designed for 6-bolt crank applications on Mopar V8 engines. The internal balance design distributes counterweight mass within the flywheel itself, providing better weight distribution than external balance systems and reducing parasitic drag. At 37.76 lbs, this flywheel strikes the ideal balance between inertia management and throttle response, giving you predictable shifts and reduced engine stress during aggressive acceleration or engine braking maneuvers.

This flywheel is ideal for restorers, hot rodders, and performance builders working with classic and vintage Mopar big-block engines—particularly 383, 400, 426, and 440 cubic inch mills. The 143-tooth configuration is the factory standard for most Mopar applications, ensuring compatibility with OEM and performance clutch systems. Installation requires proper flywheel balancing as part of your complete drivetrain assembly; CENTERFORCE recommends professional installation to verify balance specifications and ensure crank flange runout meets tolerance. For those demanding SFI certification, proven durability, and engineering precision, the Mopar BB Flywheel 143 Tooth Int. Balance delivers the reliability and performance Mopar builders have trusted for decades.