2001 8.1L / 496 Big Block Chevy Engine Video 156K Miles

[@Hazardouswastedriver]

How hard would it be to swap this into a 2000 k2500 that has the 7.4 liter in it?

[@bogbrookauto]

It would be "do-able" as they are both 24 tooth crank sensor engines. There would be a lot changing sensor pigtails and extensions. The real trick would be to find a 2001 3500HD with the 8.1L engine (First year for that combo), then you would have the harness & ECM made for the older body style truck!