Extreme Duty Flexplate - SFI SBC 57-85 153 Tooth

The Extreme Duty Flexplate - SFI SBC 57-85 153 Tooth from PRW Industries is a heavy-duty flexplate engineered for small block Chevy and V6 engines requiring maximum durability and precision. Flexplates are critical components that connect the engine crankshaft to the automatic transmission torque converter, absorbing engine vibration and transmitting rotational force efficiently. This extreme duty variant is purpose-built for high-performance, high-mileage, and demanding applications where standard flexplates fall short.

Constructed from reinforced steel with a high-inertia design, this 153-tooth flexplate delivers superior strength and reliability under stress. The SFI 29.1 certification ensures it meets stringent Society of International Motorsports safety standards for racing and performance applications. The 2-piece seal design accommodates internal balance requirements, allowing precise engine balancing while maintaining structural integrity. At 7.36 lbs, the robust construction resists cracking and fatigue—common failure points in standard flexplates exposed to aggressive acceleration, high torque loads, or sustained RPM conditions.

This flexplate is ideal for enthusiasts, racers, and mechanics rebuilding small block Chevy engines (1957–1985 model compatibility) or performing transmission swaps where durability cannot be compromised. Installation requires removing the torque converter and engine bell housing; proper alignment with the crankshaft pilot and transmission input shaft is essential for smooth operation. The 153-tooth count ensures compatibility with corresponding torque converter specifications—verify your converter teeth before purchase to avoid drivetrain mismatch. SFI certification makes this the preferred choice for sanctioned motorsports competition and high-performance street builds.