Used GM timing gear. This is the crankshaft gear.  This is a stock replacement gear for the factory link style chain (non-roller). Fits the following:

92-96 LT1 Corvette
93-97 LT1 V8 Camaro
93-97 LT1 V8 Trans Am
94-96 LT1 Impala/Caprice/Roadmaster

NOTE : This does not fit LT4!