MSD 85813 Steel Distributor Drive Gear Ford 351C-460 Hydraulic Roller Cam

The MSD 85813 Steel Distributor Drive Gear is an engineered replacement distributor gear designed for Ford 351C, 351M, 400, 429, 460, and 332-428 FE engines equipped with a hydraulic roller camshaft. A distributor's ignition timing accuracy is only as good as its drive gear — sloppy gear mesh causes timing fluctuation across the RPM range, robbing power and consistency. MSD addressed this with extensive metallurgical research and precision manufacturing to deliver a gear built for long service life and reliable performance.

Constructed from a proprietary special alloy steel and treated with a Melonite QPQ low-friction coating, this gear is engineered to reduce initial break-in wear and friction throughout its service life. The micro-polished contact surface ensures smooth, consistent engagement with the camshaft gear, while an increased outer hardened layer (RC 55-60) and high interstitial carbide concentration deliver superior wear resistance in demanding applications.

Key Features:

• Melonite QPQ coating — reduces friction and initial wear for easier break-in
• Micro-polished surface — ensures smooth, consistent gear contact
• Increased outer hardened layer (RC 55-60) — extends service life under high-load conditions
• High interstitial carbide concentration — improves overall wear resistance
• 0.531 in. distributor shaft diameter — correct fitment for Ford big-block and Cleveland applications
• No drilling required — direct installation with included roll pin
• Designed specifically for use with hydraulic roller camshafts (not for solid roller cams)
• Sold individually; roll pin included

MSD part number 85813 fits Ford 351C, 351M, 400, 429, 460, and 332-428 FE engines with hydraulic roller camshafts. UPC: 085132858132.