already learnin'.. I didn't know they did Detroit in 4020..How's it perform?..
   My 4620 powered is wonderful..Set at 175 hp..I put a smaller turbo on it-made a tractor out of it.. very quick and spunky....I got the turbo from a tractor-puller.. Back in the day when I used it in the field, I used the turbo boost gauge to judge how hard it was pulling...Radiator would keep up at 14 psi max (140 hp)  With this engine/turbo setup, I started calibrating it at 10 psi on the dyno-100hp...Held true up to 175 hp(17psi)...ate one ps tranny and one complete rear-end,though..
     If there are any 4620 guys out there that want to wake up the tractor, I should be able to figure out what the turbo is that I have on it..Makes the tractor virtually smokeless at full throttle.
 Oops, I forgot about the 5020. I know a guy who had a 5020 Detroit.. It had 300 hp, but only wide-open.. no lugging, and that NOISE!! He didn't like it either..He got pretty good money for it, if I recall..