454 Flexplate

The B and M AUTOMOTIVE 454 Flexplate (SKU BMM20233) is a heavy-duty flexplate engineered for big block Chevy 454 engine swaps and restorations. This 168-tooth flexplate delivers the precise crankshaft-to-transmission coupling required for external-balance 454 configurations, making it essential for builders working with classic muscle cars and performance vehicles that demand OEM-quality reliability.

Built to SFI 29.1 specifications, this steel flexplate meets the safety standards required for high-performance automotive applications. The 168-tooth count is purpose-matched to 454 big block engines, ensuring balanced power delivery and eliminating drivetrain harmonics that plague mismatched flexplate applications. External balance design integrates with your existing harmonic balancer, a critical consideration for engine swaps where the balancer assembly was originally tuned as a system. The 7.4 lb weight provides structural integrity necessary for handling the torque output typical of 454 powerplants.

Builders undertaking 454 engine installations—whether in vintage Corvettes, Camaros, or custom hot rods—rely on correctly-specified flexplates to prevent vibration, transmission slippage, and catastrophic drivetrain failure. This flexplate is the OEM solution for those who refuse to compromise on engine-to-transmission compatibility. Installation requires precision torquing to factory specifications and proper alignment with your transmission's input shaft.

The 454 represents one of Chevrolet's most iconic big block engines, and sourcing correct mechanical components—not aftermarket substitutes—is critical for long-term reliability. This B and M flexplate is the specification-correct choice for serious engine work.