MSD's engineers researched and tested a variety of metallurgical compositions, heat treatments, and coatings to build a durable, accurate, and strong distributor gear. The result is a special iron alloy gear treated with a low-friction coating process for long life, an easy break-in period, and reliable performance.
Specifications:
- Material: Proprietary formulated ductile iron
- Coating: Melonite QPQ, reduces friction and initial wear
- Hardness: Increased outer hardened layer thickness (RC 55-60)
- Surface: Micro-polished for smooth contact
- Interstitial carbide concentration improves wear resistance
- Inner Diameter: .500"
- Distributor Type: Accessories
- Country of Origin: USA
- Part Number: 8531
FAQ
What is the MSD 8531 gear made from?
It's made from a proprietary formulated ductile iron alloy treated with a Melonite QPQ low-friction coating.
What ID does the MSD 8531 gear have?
It has a .500" inner diameter, sized for MSD Chevy distributors.
What hardness does the gear surface reach?
The outer hardened layer reaches RC 55-60 with a micro-polished surface for smooth contact.
Where is the MSD 8531 gear manufactured?
It's manufactured in the USA.

