The most common use for these monsters was irrigation pumps where that would run them at about 2350 rpm for 5-6 mounths at a time,shut them down long enough to change oil,oil filter and plugs,typically would run like this for 6-8000 hours before the first overhaul,They were also used in BIG trucks and fire trucks.With a few parts from Thunder v-12,they can be turned to about 5000 rpm,and make about 750 ft.lbs of torque and about 450 hp.:eek