Posted by Charlie Biler x on February 07, 2010 at 20:50:21 from (64.201.85.120):
In Reply to: 1947 utu puller posted by Lead Foot on February 06, 2010 at 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.
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F). Expedited shipping available, just call! Most prices for parts and manuals are below our competitors. Compare our super low shipping rates! We've kept the same low rate for six years. We are a Company you can trust and have generous return policies! Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ More Info ]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
About this site - Yesterday's Tractors is your one-stop source for antique tractors. If you use antique tractors, collect antique tractors, or just enjoy looking at antique tractors, welcome to our site! Join more than 275,000 other classic tractor enthusiasts from all over the globe. We have many resources for antique tractor enthusiasts available including photos, classified ads, more than 24 antique tractor forums, show guide, values, specs and much more. Bookmark this site and come back often. Thanks for stopping by! Feel free to use our feedback form to send us your comments, suggestions and ideas.
