MSD Distributor Bushing
MSD HDW10081 Sintered Iron Distributor Shaft Bushing 0.625 OD x 0.500 ID x 1.500L
MSD Distributor Bushings: Precision Timing Control from an Ignition Legend
When it comes to ignition performance, few names carry more weight than MSD. MSD (Multiple Spark Discharge) has been at the forefront of ignition technology since 1970, and their distributor bushings reflect the same engineering discipline that has made them the choice of racers in NHRA, IHRA, and NASCAR for over five decades. Within the broader world of distributor bushings, MSD occupies a unique position — these are components designed specifically to complement MSD's own high-performance distributor ecosystem, ensuring that every part works in harmony.
What MSD Distributor Bushings Do
A distributor bushing plays a critical role in controlling mechanical timing advance. Inside a distributor, advance limit bushings physically restrict how far the timing advance mechanism can rotate, setting the maximum advance ceiling for a given engine tune. Getting this right is essential for performance builds: too much advance under boost or at high RPM can cause detonation, while too little advance leaves power on the table.
MSD addresses this with precision-machined bushings that allow tuners to dial in exactly the amount of mechanical advance their application demands. Their flagship offering in this space is the MSD Bushing & Spring Set (PN 8464). This kit includes six advance stop bushings covering 18, 19, 21, 23, 25, and 28 degrees of advance. The MSD distributor advance kits are the same kits that come with your MSD distributor , making them a genuine factory-equivalent replacement and tuning tool in one package. They are designed specifically for MSD Billet distributors.
The Low Resistance HEI Bushing
MSD also produces a specialized bushing for GM HEI distributor applications. The carbon rotor button in a stock HEI distributor cap has very high resistance, and when the high voltage of an MSD 7-Series Ignition is added, this resistance builds up heat and can actually melt the distributor cap. The solution is the MSD Low Resistance HEI Bushing, which passes the secondary voltage from the distributor cap to the rotor without excessive heat buildup. This makes it an essential upgrade for any HEI-based build running an MSD high-output ignition box.
Why Trust MSD for Distributor Components?
Over the course of 40-plus years, MSD Performance has been driving the development of innovative components that helped shape the way our cars race and perform. MSD Ignition was the first company in the world to experiment with Multiple Spark Discharge for the ignition system of internal combustion engines. That heritage of precision engineering carries directly into their distributor accessories. MSD distributor accessories — from replacement caps and rotors to advance kits, hold-down clamps, drive gears, and gaskets — are built to the same high standards as their distributors.
For performance enthusiasts building around MSD's Pro-Billet or Ready-To-Run distributor platforms, using MSD's own bushings ensures exact fitment and calibration compatibility. Whether you're fine-tuning a street cruiser or dialing in timing for race day, MSD distributor bushings give you the control you need at a component level that is often overlooked but critically important.