Some camshaft materials, particularly billet cores, will chew up a standard iron distributor gear and require a bronze gear instead. This one is machined from AMPCO 45 aluminum bronze with five percent nickel, an alloy chosen because the tooth strength holds up against the side load a high-volume oil pump puts on the drive.

MSD 85631 Bronze Distributor Drive Gear Features:

• Fits Pontiac V8 distributors using a 0.500 in. shaft.
• Machined from AMPCO 45 aluminum bronze containing 5 percent nickel.
• High-strength gear teeth resist wear even with high-volume oil pumps.
• Intended for camshafts that require a bronze distributor gear.
• Kit includes a rolled roll pin and gear break-in lubricant.