Distributor Shim

The MSD IGNITION Distributor Shim (Part No. WAS10090) is a precision steel spacer designed to fine-tune distributor housing alignment in various ignition systems. This shim is essential for achieving optimal ignition timing and reliable engine performance in both performance and stock applications.

Constructed from hardened steel, the shim maintains dimensional stability under heat and vibration. It is designed to accommodate standard distributor shaft sizing, ensuring a proper fit against the distributor housing bore. Proper shimming is crucial for reducing misfires and maximizing spark delivery consistency.

Engine builders and tuners rely on distributor shims when dialing in ignition geometry during various tuning processes. This shim corrects alignment issues without requiring distributor core swaps or block machining, making it a valuable tool for those involved in street performance, drag racing, and restoration builds.