There are several choices when it comes to buying a performance starter. Powermaster has a wide range of choices to fit just about any application. Narrowing the choices down to exactly the right unit can be accomplished in three steps: Step 1:Torque Requirements-Speaking in general terms, a over 12:1 compression or higher engine should use a 200 ft.lb. starter. Engines up to 12:1 should use at least a 180 ft.lb. starter. 160 ft.lb. starters are good for engines up to 10.5:1.Step 2:Fitment-Consider headers, oil pans, and the mounting points on the engine and what size ring gear do you have. Step 3:Weight-Lastly, depending on the form of racing, the overall weight of the starter is a consideration.