Chevrolet engines are probably the most commen make of V8 on the market, coming in Big Block and Small Block versions. If you are unsure of what engine you have then e-mail me the casting numbers which can be found on the rear drivers side flat shoulder behind the cylinder head. From this i can identify the size and year of make so you can order the correct parts for your application. One thing to remember is engines can be changed at any time in a cars life so dont assume that the engine in your car is the correct one. If you can allways check the casting number.