5500 could be done I guess, but she would be tough.  rebuild the engine with D17D pistons, then have them machined to any comp ratio you want

That would depend upon how much money you want to throw at it, and the rules for the class / club you pull with. But, to answer best I can 100 hp should be fairly easy, and 5500 should not be too much work.  A d19 is too new for a lot of clubs rules, I think that is why you don't see more of them pulling.  Where I pull it is 1960 and older.

 Not where I'm at , but I know some rules state if the tractor was in production in say from 57 thru 62, then you could pull the 62 model year tractor. NATPA?  My D17 is a 59, and I was at a pull in Fowler Mi, 57 was supposed to be the cutoff,  They took my money and  I pulled a 2nd place. They didn't seem to care for "outside the club" pullers.  I wouldn't go back. I have to say tho, the club I pull with has some stupid rules and  those rules  may discourage new pullers from attending .

 Allis used a 262 gas in the cotton picker d-17 and that makes lt leagal. I have a pic of a puller. My sugestion is cuchshutt 50 motor 262 crank cam head from a c 3 combine the combo makes 290 cu. or a lp combine motor to start with. sorry lost the pic

Thanks for the advise-we are sick of watch of watching the green and the red at all the pulls. That is why we are looking for a strong  AC that would be competitive with some money spent to help the cause. 

Not sure the difference in weight from gas or diesel but I have a buddy that pulls a 19 diesel with us in the 6000# class and runs cast centers and 18.4x38 taurus radials. So I'd think you could get down to 5500 easy enough. Good luck.

Computation Results:

Engine Horsepower (peak) is 70

Old Compression Ratio is 8.0

New Compression Ratio is 15.1

Computation Results:

Computed New Engine HP is 82, a 17 percent change

301  will bolt to the torque tube with all but one 1/2" bolt behind starter, redrill hole in back plate to match. You will have to grind a little in the bell housing for flywheel to clear, not enough to weakin housing, also around starter bore so 301 starter will fit. You will have to build frt end to fit engine, but you want to make lighter anyway.  There is one running in Ga. unless you know allis engines you can't tell it's not foctory.  Sam T-Ga.

I'm not sure but there's nothing on the back, no fenders, lift arms, pto. I don't know what else he could take off. His front end don't come off the ground either.( We're pulling dead weight on concrete so it's not that tough in that class).

A friend of mine had a gasser many moons ago with 18.4 x 34's on 9 hole pressed steel with dual hubs on the axle and a D17 narrow front pedistal. No hydraulic pump, lines or valves, no lift arm housing and the snap-coupler bell/spring assembly completely removed....a lightweight seat  and no fenders and with him on the seat (200 lbs) could make 5000 pounds. I also had a D17 at the time that would make 4000 lbs with 15.5 x 38's.

He was competitive for the times....we had diesel pistons with .200" removed from the tops and a 190XT Bendix carb and a cam with a mild grind...governor weights lightened up dramatically for 4000 rpm. As time went on, any good 560/460 IH with a 301 engine was near impossible to beat with a G262.