I want to build a 460-I want to do a turbo diesel

[averagef250]

800HP is very unrealistic with bolt on parts, but 800 lb/ft is completely realistic.

In diesel world HP is mostly meaningless. TQ is what you're after since diesels can make insane torque numbers at very low RPM. As a general rule, a mechanical 5.9 Cummins makes atleast 2.2 lb/ft per HP. That means a 200 HP engine is making 440 lb/ft, a 400 HP engine is making 880 lb/ft, etc. When your surpass around the 350 HP mark and get into the 800 lb/ft area you really start to understand why it's pretty wild anyone decided to put the 5.9 in a pickup. The biggest issue is putting that power to the ground. Regular pickup parts break, slip and come apart with that kind of torque going through them. You can lose 1/2 the HP of the engine through a sloppy torque converter.

I think it'd be a lot of fun in a SWB, but I'd never want to tow with it. Too easy to get in a hell of a lot of trouble with an overpowered light short wheelbase truck towing. You could have 10K behind you and have absolutely no idea it weighs as much as it does until you head down a hill and have no way to slow it down.