An R would not be competitive at that weight in those divisions. About 50hp is all you can get from the flathead style motor. At 4500lbs you would be pulling against Oliver 88's and Farmall M's. Not a fair fight.
Re: R Puller? in reply to Joe Leising, 02-12-2013 13:11:28
My uncles have an R with a ZA (206) engine. It dynoed more hp than their ZA, but could not beat the ZA in a pull, because it was losing power through the transmission. They had their R down to 3500 with the driver. 4500 is probably too much for an R.
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