MSD 85833 Ford 289/302 Steel Distributor Gear for Hydraulic Roller Cam

The MSD 85833 is a high-grade steel distributor drive gear engineered specifically for non-EFI Ford 289 and 302 small block engines equipped with hydraulic roller camshafts. MSD invested extensive research into metallurgical composition, heat treating, and coating processes to produce a distributor gear that delivers durability, precise timing, and long service life.

This gear features a 0.468-inch inner diameter and serves as a direct replacement for carbureted Ford distributors as well as MSD distributors PN 8582, 8579, 8479, 8352, and 8503. A roll pin is included. Excessive gear clearance causes timing fluctuation across the RPM range and lost horsepower — MSD addresses this with tight gear mesh tolerances machined for precise camshaft-to-distributor gear engagement.

Key Features:

• Micro-polished surface for smooth gear tooth contact and reduced break-in wear
• Increased outer hardened layer thickness (RC 55–60) for superior wear resistance
• Melonite QPQ coating reduces friction and minimizes initial wear during break-in
• Interstitial carbide concentration improves overall wear resistance and long-term running properties
• 0.468-inch inner diameter — precision-machined for proper distributor shaft fit
• Roll pin included — no additional hardware required
• Compatible with MSD Distributors PN 8582, 8579, 8479, 8352, and 8503
• Designed for use with hydraulic roller camshafts on non-EFI small block Ford engines

Sold individually. Legal for use on emissions-controlled vehicles, non-emissions-controlled vehicles, and racing applications, as this part does not affect vehicle emissions.