Do you truly have a Farmall 504 row crop or do you have an International 504 Utility, and are calling it "Farmall" out of habit/mistake?
It's quite common for folks to call any red tractor a "Farmall."
Comparing the 550 to a 504U would be a much fairer comparison. The 504U has about 5HP more. The 504U is about 1000lbs heavier. Still not equal, but more fair.
If you were talking about an earlier era, the Oliver would be the more advanced tractor for the time. In this case, it's about even.
Puttering around, mowing, raking, pulling trailers, general light work, it'd be close but the 504 has a slight edge in my book due to the slightly faster 4th gear (7.8MPH) vs. the 550's 5th gear (7.2MPH). The 504 will have a slight edge in heavier work due to weight and HP.
I'm not real big on utility tractors, so if the 504 were a Farmall I'd choose that due to the flat deck.
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Today's Featured Article - Usin Your Implements: Bucket Loader - by Curtis Von Fange. Introduction: Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he rea
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