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Lead Foot 02-06-2010 22:49:06 207.65.110.76 51761 Report to Moderator	hey boys. does any of the younger generatins out there know if i can build my ole 47 utu up to be a respectable puller. any enginr mods or anything would be of great help. god bless. leadfoot [Reply]   [No Email]
ub man 02-09-2010 10:20:48 216.74.200.88 51827 Report to Moderator	Re: 1947 utu puller in reply to Lead Foot, 02-06-2010 22:49:06   I got a 1951 u and i put m5 blocks and 4 5/8 piston and i got 75 hp and pull in 5000 and up pull pretty damn good   [Reply]   [No Email]
Charlie Biler x 02-07-2010 20:50:21 64.201.85.120 51783 Report to Moderator	Re: 1947 utu puller in reply to Lead Foot, 02-06-2010 22:49:06   Lead Foot, Around here, the UTU is almost the standard in tractor pulling. In the mid weight classes they win consistently because they are the majority, and darn tough too. Every farmer drops in a worn out 403 engine after it has been overhauled. The transplant is a one night job and any one that can turn a bolt laughs at the ease of the job. Everything fits with no special machining. The nice thing about re-powering a U is that it still can go to the field and still bring in a crop. The favorite trick is to drop in a set of larger intake valves and bore a 403 donor engine out to 4.75". That gives a nice 425 cubic inch engine that has a 0.79 bore to stroke ratio. They still have enough low end to place in dead weight contests too. Don't turn your nose up on a stock 403 engine. You can also drop on a 336 cubic inch top end and not have to even split the tractor. For pure wide open pulling, those 336 engines are cheap thrills. With a 0.93 bore to stroke ratio, they like to perform with more RPMs. A bone stock 283 engine in a U is not something the competition laughs at. The 283 has a ratio of 0.85 and it will move a U down the track, quite nicely, in the 5500 pound class. A lot of young kids, and those like me that refuse to grow up, can easily put a U on a diet to get it to these classes. Those stock 403s in a U bite the competition mighty hard too. We have one local boy, with grandkids, that runs a UTU with a totally worn out 403 engine. He has tossed every thing to pull in the 5000 pound class. The tractor has no starter, generator, battery, electrics, or even paint. That ugly duckling UTU consistently gets a trophy. I doubt he even puts high test gas in it. Welcome to the dark side. Charlie   [Reply]   [Send Email]
Ray Tellin 02-07-2010 07:13:09 199.120.66.167 51768 Report to Moderator	Re: 1947 utu puller in reply to Lead Foot, 02-06-2010 22:49:06   A well tuned 403 can get you 85-90 horsepower. It will bolt right in also!   [Reply]   [No Email]
jd plowboy 02-07-2010 07:02:13 98.104.214.164 51767 Report to Moderator	Re: 1947 utu puller in reply to Lead Foot, 02-06-2010 22:49:06   if it has the one piece head on it you cant do much with it but it should pull very good in the stock classes like it was. my brother had one and i did very good in stock but he couldnt change anything on it but the air cleaner. if it is the 2 piece jug motor you can add a 6 inch crank out of a G and the jugs and it will make it a 403 ci motor.   [Reply]   [No Email]
Molineone 02-07-2010 06:07:29 75.73.135.181 51766 Report to Moderator	Re: 1947 utu puller in reply to Lead Foot, 02-06-2010 22:49:06   Sure, it just takes time and money. I am currently building my UTU into a puller with 336 jugs/pistons etc...   [Reply]   [No Email]