Flexplate SFI 166-Tooth Buick 403-455 67-76

The Flexplate SFI 166-Tooth Buick 403-455 67-76 is a heavy-duty flexplate engineered for big-block Buick engines, designed to connect your engine's crankshaft to the automatic transmission while absorbing torque spikes and vibration. This component is essential for any builder or restoration specialist working with 1967–1976 Buick 403 and 455 cubic-inch engines, particularly those seeking OEM-correct or performance-grade replacements. The flexplate serves as a critical interface in automatic transmission applications where it must withstand extreme rotational forces and thermal cycling.

Constructed from steel and rated to SFI 29.1 safety standards, the Flexplate SFI 166-Tooth Buick 403-455 67-76 features external balance characteristics and a 166-tooth ring gear configuration that matches Buick's factory specifications for this engine family. The external balance design ensures proper weight distribution when paired with compatible external balance crankshafts, preventing harmful vibration during operation. SFI 29.1 certification confirms compliance with automotive racing and high-performance standards, guaranteeing durability under sustained high-RPM conditions and demanding load scenarios typical of hot rod, street performance, and restoration applications.

This flexplate is ideal for restorers building authentic Buick muscle cars, performance enthusiasts upgrading transmission systems, and engine builders assembling big-block Buick powerplants for street or strip use. Installation requires proper alignment with the transmission's torque converter and careful balance verification if the engine has been freshly balanced. The 166-tooth count is specific to Buick 403–455 applications from the 1967–1976 model years, making compatibility verification essential before purchase to ensure correct fitment with your transmission and engine combination.