Flexplate CM SFI Pontiac 326-455 V8 1967-79

The Flexplate CM SFI Pontiac 326-455 V8 1967-79 is a heavy-duty flexplate designed for serious engine builders and restorers working with classic Pontiac V8s. This component serves as the critical connection between your engine's crankshaft and automatic transmission, absorbing vibration and misalignment while transmitting torque smoothly. Whether you're rebuilding a stock 400, modifying a 455 big-block, or restoring a high-performance 1970s muscle car, a quality flexplate is non-negotiable for reliability and longevity.

Manufactured by PRW Industries, this flexplate features 166 teeth and meets SFI 29.1 safety certification—the industry standard for high-performance and racing applications. The chromoly steel construction with cadmium plating provides superior strength and corrosion resistance compared to cast-iron alternatives, essential for handling power increases from bolt-on modifications or engine stroking. Its internal-balance design integrates smoothly with stock crankshafts, eliminating the need for external balancing weights and simplifying installation on original or street-performance builds.

This flexplate is engineered for Pontiac V8 models spanning 1967 through 1979, covering the 326, 389, 400, and 455 cubic-inch variants in both stock and modified applications. Weighing 6.65 pounds and measuring compact at 13.9 x 0.7 x 14.2 inches, it bolts directly to the crankshaft with standard fasteners. Install one when rebuilding your engine, upgrading to a higher-stall converter, or switching transmissions—it's the foundation of a reliable power delivery system that won't fail under sustained acceleration or high-RPM operation.