TA offers brand new steel or bronze distributor gears for most Buick V6 and V8 applications. Use our steel gears as a direct replacement for a stock application. Use the bronze gear to protect the cam gear from wear. The bronze gear is required for use with roller cams. Also recommended for use with conventional cams when the loads on the cam are increased such as with high volume oil pumps. Please note that the bronze gear is a sacrificial piece, it will wear fairly easily, varying based on set-up. You will want to monitor the gear for wear and develop a regular schedule of replacing the gear. Ask a TA Tech for additional information. 350 gears fit 215,225,231,300,340,350. 455 gear fits 400-430-455.