SFI Flexplate GM LS1

The TCI SFI Flexplate for GM LS-Series engines is a precision-engineered flexplate designed to transfer torque from your automatic transmission to the engine's crankshaft while accommodating minor misalignment. Built to SFI 29.1 certification standards, this 168-tooth steel flexplate is engineered for high-performance and street applications requiring reliable torque delivery and thermal stability under demanding conditions.

Constructed from steel with internal balance characteristics, this LS1 flexplate measures 14.3 x 1.2 x 14.6 inches and weighs 8.9 lbs. The 168-tooth design provides proper engagement with your torque converter while the internal balance configuration ensures smooth operation without secondary vibration. SFI 29.1 certification indicates this component meets rigorous safety and durability standards for automotive performance use, making it suitable for both rebuilt engines and upgraded powerplants where proper crankshaft-to-converter interface is critical.

This flexplate is engineered for LS-Series engine platforms paired with automatic transmissions. It serves builders, performance shops, and enthusiasts performing engine swaps, rebuilds, or transmission upgrades who require OEM-quality or superior flexplate replacement. Proper flexplate selection is essential for transmission compatibility, preventing converter slip, and maintaining driveline integrity during acceleration and load conditions.

The flexplate is a critical but often-overlooked component in automatic transmission systems. Unlike manual clutch flywheels, flexplates absorb converter oscillation and provide the interface for torque multiplication. TCI's offering combines proven steel construction with SFI certification, ensuring compliance with safety standards for high-horsepower applications while delivering the precision fit required for LS-Series engine compatibility.