Well by going to a 291 you will gain Hp. around 10- 15 pony's As for the dist and the timing that needs to be done on a dist. strob machine as the advance curve needs to be changed to limit the total advance . Then when ya set the timing ya try and keep the TDC set for easy starting and then the advance curve is limited to a total of no more then 19 degrees at rated RPM. . Are you Crazy for fixen this tractor , Well that all depends on what you think it is worth are you crazy for farmen with a gas tractor I don't know how much you are tryen to farm or your operation . Like i said around here we have a ton of gas powered tractors that still go out and do a long days work . My two good buddys - friends both have 706 gassers that i sold them many years ago . When the cold weather sets in the diesels get put away and we use the gassers for the chore work as they will start in just about any weather above -40 below have faster warm up don't have to worry about plugen them in . They have the Hp. to run the grinder mixer and do the feeding . And yes they do use gas when working . The one 706 use to do all the heavy work till i sold my buddy a 1066 . Now the 706 would go out all day plowing pulling a set of 540 4x16 semi mount plows going down 8-10 inches deep and in a long day she would suck up 35-40 gallon of gas . Put the 1066 in the same fields with a set of 710 5x16's and cover the same ground a bit faster BUT suck up 45-55 gallon of diesel. When the 706 needs a rebuild i can run thru that engine for under a grand but when the 1066 takes the big dump we are looken at around three grand . as it will be and out of chasie and the pump and injectors wil get changed and we will up grade that engine to the B seires along with a new turbo . Now mabe down the road you may want to get a diesel and move the 656 back to a chore tractor . Look at it this way even if ya do rebuild upgrade the 656 it is paid for So ok you rebuild the engine put a new clutch in paint the tractor put new tire on it a new seat even a new hyd. pump and a new T/A ya have a new old tractor and if you are the one happy with it that is all that matters. Do it once and do it wright and don't worry about it. Look around and find some old fart that knows what he is doing and a machine shop that knows how things are done wright the first time . Ask around talk to people in your area . If you were close i would help ya and show you how it is done and tell ya why . .
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