Pro Series Flexplate SFI 29.1 70-90 BBC 168T

The Pro Series Flexplate SFI 29.1 70-90 BBC 168T is a precision-engineered flexplate designed for big-block Chevrolet engines paired with automatic transmissions. Built by PRW Industries—a trusted name in high-performance drivetrain components—this flexplate bridges the engine's crankshaft to your transmission while absorbing rotational harmonics and vibration. Whether you're building a street machine, drag racer, or high-output restomod, a quality flexplate is non-negotiable for reliability and smooth power delivery.

The 168-tooth configuration and SFI 29.1 certification ensure compatibility with modern starter motors and meet sanctioning body standards for racing and street use. The flexplate's dual-sided damping design reduces stress concentration and harmonic vibration that can crack welds or loosen fasteners over thousands of heat cycles. Weighing 7.705 pounds and engineered for BBC (big-block Chevrolet) applications in the 1970–1990 era, this component handles the twisting forces inherent to boosted, nitrous-assisted, or high-rpm naturally aspirated engines. PRW's manufacturing tolerances guarantee runout and balance specifications critical to long-term driveline health.

Mechanics and engine builders rely on this flexplate for any BBC engine swap, transmission rebuild, or performance upgrade involving a 1970–1990 Chevrolet big-block. Its SFI certification makes it street-legal and competition-approved, simplifying compliance for vintage drag racing or autocross. Installation is straightforward—bolt it directly to your crankshaft flange and secure your torque converter—but proper balancing and runout checking before final assembly is recommended. Check your transmission bell housing and starter clearance during fitment to ensure no interference with surrounding components.