GM 1-Piece Rear Main Seal 168 Tooth Flywheel

The GM 1-Piece Rear Main Seal 168 Tooth Flywheel from Blueprint Engines is an essential component for General Motors engine builds that require reliable crankshaft sealing and effective flywheel geometry. This flywheel is ideal for street builds, race applications, and engine rebuilds, ensuring that oil leakage at the crankshaft's rear end does not compromise engine longevity.

This one-piece design integrates the rear main seal into a single, precision-balanced component, eliminating the vulnerabilities of older two-piece configurations. The flywheel features a 168-tooth ring gear designed for optimal starter motor engagement, providing reliable cold-start torque transfer. Constructed from cast iron with an elastomer seal insert, it is engineered to resist oil degradation and thermal cycling, which is crucial for modern lubricants.

This flywheel is compatible with GM's small-block and big-block engine families, including both Gen I and Gen II engines, making it a versatile choice for various applications. Whether you're completing a crate engine installation or refreshing an original power plant, this flywheel ensures smooth engagement and minimizes vibration, enhancing the overall performance of your vehicle.