Flywheel Shim 6 Hole

The BERT TRANSMISSIONS Flywheel Shim 6 Hole is a precision aluminum spacer engineered for Small Block Chevy and V6 engine builds requiring critical flywheel timing adjustment. This 0.038-inch thick shim sits between the flywheel and crankshaft flange, allowing builders and performance mechanics to fine-tune ignition timing, correct flex-plate runout, or compensate for deck height variations during engine assembly or transmission swap operations.

Manufactured from lightweight aluminum in a natural finish, the Flywheel Shim 6 Hole features a compact 4.75-inch diameter with six bolt holes that align with standard Small Block Chevy and V6 crankshaft patterns. The 0.038-inch thickness provides measurable clearance adjustment without excessive material removal or modification to engine components. At just 0.05 pounds, it introduces minimal rotating mass while maintaining structural rigidity under high-RPM conditions, making it ideal for street, strip, and racing applications where precision tolerances directly impact drivability and longevity.

This shim is essential for rebuilders addressing timing drift, transmission installation gaps, or crankshaft variations across different engine generations. It's commonly paired with BERT performance flywheels and transmission packages where OEM spacing doesn't match modern aftermarket components. Mechanics performing cylinder head work, block decking, or engine swaps frequently use one or more shims to restore factory geometry or optimize clearance for upgraded transmissions, turbo installations, or stroker builds.