I have a carb 200,2.5,which with a 25 tempest has a killer hole shot.It just I turn it 7 grand,a little too high for stock pistons ect for me. It had a good hole shot on my old 18ft,1050 lb bass boat and on the allison it's kick ass. It gets up good even with a stock 28 chopper-2. Of course I only have been running with a fishing load and only me in the boat.I weigh 225,but It isn't the dead of summer yet which hurts your hole shot even when you are below sea level. I tried my brothers 26 trophy and it had a good hole shot and that was with 3 people,dog kennel with two beagles,guns,hip boots ect. Never thought I rabbit hunt out of an allison.