This Edelbrock Distributor Gear #22735 is a steel drive gear intended to replace the iron gear that comes installed on Pro-Flo 4 and Max-Fire Ready-To-Run distributors for Small-Block 289-347 and 351W engines that are running a steel-core hydraulic roller camshaft. This steel drive gear is designed specifically for the Edelbrock distributors with a 0.531-inch-diameter shaft for small-block 289/347/351W applications. The overall diameter of this gear is 1-1/4 (1.249) inches and features a yellow painted dot for identification. This gear is compatible with the following Pro-Flo EFI and Max-Fire distributors: #22758 (Max-Fire for SBF 351W); #54-0200 (Pro-Flo EFI kit distributor for small-block); #35930 (289-347) #35940 (289-347); #54-3541 (Pro-Flo EFI kit distributor for small-block); #35950 (351W).