Brand: Allstar Performance Manufacturer's Part Number: ALL81310 Part Type: Distributor Gears Product Line: Allstar Performance Bronze Distributor Gears Automotive Fittings Part Number: AAF-ALL81310 UPC: 848238041453 Distributor Shaft Diameter: 0.491 in. Distributor Gear Material: Aluminum/Bronze Drilling Required: No Roll Pin Included: Yes Quantity: Sold individually. Notes: Fits GM HEI distributors. Description: If you are going to install a steel billet roller cam, then you will need a bronze distributor gear instead of the original cast iron gear. Allstar Performance bronze gears are constructed from premium aluminum bronze to provide high strength to handle the stresses produced by high-pressure oil pumps. Allstar Performance bronze distributor gears include roll pins.