Flexplate 168T External Balance 86-up

The Flexplate 168T External Balance 86-up from ALLSTAR PERFORMANCE is a steel flexplate engineered for small-block Chevy engines requiring external balance characteristics. This 168-tooth flexplate features a one-piece seal design and is purpose-built for high-performance engine combinations where external balance requirements demand precision-matched components between engine and transmission assembly.

The 168-tooth count specifies compatibility with standard small-block Chevy starter motors and crankshaft flanges manufactured from 1986 onward. External balance flexplates are critical when an engine has been balanced as an external balance unit—meaning the counterweights on the crankshaft and damper are positioned to achieve balance without relying on internal balancing alone. Using an incorrectly balanced flexplate with an externally balanced engine creates vibration, bearing wear, and potential drivetrain damage. The one-piece seal design simplifies installation and reduces the likelihood of leakage at the crankshaft interface compared to multi-piece seal configurations.

This flexplate is essential for rebuilds, stroker engine swaps, and high-rpm applications where factory original or improperly matched flexplates fail to accommodate the engine's balance specifications. Builders and engine shops frequently specify ALLSTAR flexplates when constructing or refreshing small-block Chevy powerplants destined for street rods, muscle cars, race vehicles, or performance street applications. Verifying your engine's balance type—internal or external—before selection is critical to avoid costly alignment and vibration issues after installation.