Oversize Chevy Distributor Gear, Bronze, +0.006 'S Bronze Oversized Gears Help Obtain Perfect Timing By Meshing To The Camshaft Gear Properly MSD IgnitionMSD Bronze Distributor gears are machined from quality AMPCO 45 aluminum bronze containing 5% nickel. This special combination creates high strength gear teeth that are less prone to wear even with high volumn oil pumps. Absolute timing accuracy cannot be achieved until every mechanical detail is handled. Designed for camsafts requiring a bronze distributor gear Special alloy creates high strength gear teeth for less wear even with high volume oil