HD Billet Flexplate - SFI - Chevy V8 139 Tooth

The HD Billet Flexplate - SFI - Chevy V8 139 Tooth is a purpose-built drivetrain component for high-performance and modified Chevrolet V8 engines requiring maximum reliability and precision. Flexplates connect the engine's crankshaft to the torque converter in automatic transmissions, and this billet unit is engineered for enthusiasts who demand OEM-plus durability without compromise. Whether you're building a street performance engine, upgrading a stock transmission, or preparing for extreme duty, this SFI-certified flexplate handles elevated power levels and sustained abuse that cast alternatives cannot tolerate.

Manufactured from true billet steel, this flexplate eliminates the weak points inherent to cast designs—porosity, stress concentration, and catastrophic failure under shock loads. The 139-tooth configuration matches factory Chevy V8 specifications, ensuring seamless integration with your existing starter and reluctor ring setup. Internal balance design means it's pre-weighted to work with balanced crankshafts and rotating assemblies, eliminating the need for costly custom balancing after installation. The two-piece seal arrangement minimizes fluid leakage at the crankshaft interface, a critical feature when running higher line pressures or aggressive transmission tuning. SFI 29.2 certification validates this component for road racing and competition use, backed by rigorous testing standards.

This flexplate is ideal for Chevy V8 owners upgrading from cast OEM units or transitioning to performance-rated transmissions that demand stronger drivetrain components. Installation requires removing the transmission and bellhousing—standard automotive work for most mechanics and shops. Compatibility is direct for small-block and big-block Chevrolet V8 engines using 139-tooth starters and automatic transmissions. Proper torque specifications and alignment during installation are essential; consult your engine builder or transmission specialist for application-specific guidance. At 9.1 lbs, this billet unit offers negligible weight penalty compared to cast alternatives while delivering measurably superior strength and longevity in demanding service.