Powermaster 6.2L / 6.5L GM Ultra Duty StarterUpgrade your existing starter's performance with a new Powermaster Ultra Duty Diesel starter. These starters are stronger, faster, and tougher! They are able to turn over the most aggressive diesel engines in the harshest of environments. Featuring a 3. 80: 1 gear reduction, 260 ft. lbs. of torque and 3. 6 horsepower these Powermaster Ultra Duty Diesel starters can handle anything. Make Model Years Engine Model Notes Notes GM 1992 to 2002 GM 6. 5L 6.