COMP Cams Melonized Distributor Gear Chevrolet SB/BB .491in IDMelonized distributor Gears from COMP Cams are designed to provide universal compatibility for any Steel, cast iron or ductile iron Camshaft, but without the wear concerns of bronze options. Melonized Gears are less wear prone and feature better timing accuracy and higher strength than any other universally compatible distributor Gear. Includes (1) Gear for Small and Big Block ChevyFits . 491" Shaft DistributorsMelonized Iron Construction Catalog User