Extreme Duty Flexplate - SFI BBC 70-90 168 Tooth

The Extreme Duty Flexplate - SFI BBC 70-90 168 Tooth from PRW Industries is engineered for high-performance big block Chevy engines that demand reliability under extreme conditions. This flexplate serves as the critical connection between your engine's crankshaft and transmission, transferring torque while dampening vibration and absorbing shock loads. Designed for serious enthusiasts and professional builders who run their engines hard—whether in bracket racing, street performance, or heavy-duty applications—this component replaces the factory unit with superior engineering and SFI 29.1 safety certification.

Built from premium steel, the Extreme Duty Flexplate features 168 teeth for reliable starter engagement and incorporates a high-inertia design that minimizes unwanted vibration transfer to the driveline. The external balance configuration ensures compatibility with external harmonic balancers commonly found on stroker and modified big block Chevy engines, while the two-piece seal design accommodates various crankshaft specifications within the 70–90 displacement range. PRW's Xtreme Duty Platinum construction delivers exceptional fatigue resistance and durability, critical for engines producing elevated horsepower and torque output without premature failure.

This flexplate is ideal for owners of big block Chevy engines—particularly those with custom builds, performance modifications, or racing applications—who require OEM-quality reliability with enhanced durability margins. Installation requires standard transmission bellhousing and crankshaft compatibility; verify your engine's external balance configuration and seal type before purchase to ensure proper fit. SFI 29.1 certification provides confidence in safety standards for competition environments, making this component a trusted choice for both street and track use.