Pro Series Flexplate SFI 29.1 70-90 BBC 168T

The Pro Series Flexplate SFI 29.1 70-90 BBC 168T is a heavy-duty flexplate engineered for big-block Chevrolet engines running 1970–1990 model years with 168-tooth starter ring gears. This component serves as the critical link between your engine's crankshaft and automatic transmission, absorbing rotational vibration while maintaining precise alignment under high-load conditions. Whether you're building a street machine, restomod, or performance cruiser, a quality flexplate is non-negotiable for reliable power transfer and longevity.

PRW Industries manufactures this flexplate to SFI 29.1 certification, the industry standard for racing and high-performance applications, ensuring it meets strict damping and safety requirements during extreme acceleration and engine load cycles. The 168-tooth configuration matches original BBC starter geometry for seamless retrofit compatibility, while the forged construction provides superior flex characteristics compared to cast alternatives—reducing harmonics that can cause torque converter slip and transmission wear. At 7.7 pounds, this flexplate delivers the durability needed for serious horsepower without sacrificing the responsiveness critical to BBC engine combinations.

This flexplate is ideal for mechanics and enthusiasts rebuilding or upgrading 1970–1990 big-block Chevrolet engines paired with automatic transmissions. Installation requires engine-out service, making it a logical choice during a full rebuild or transmission swap when the flexplate can be replaced alongside your torque converter and transmission service. Verify your starter ring gear tooth count and crankshaft bolt pattern before purchase to ensure proper fitment with your specific BBC application.