If you are intent on using it for daily use then I would recommend a reground cam, a C-281 gas head, a C-281 gas manifold (three rib), and the right carb setup. Also making the head flow and port matching the manifold make a big difference. If you have not bought your pistons then I would have your block checked to see if you can bore it to 4.375 and run a custom piston on the block. If this helps I have a used C-281 with 4.125" comformatic pistons that has 67 hp at 540. I plan to put a reground cam in it this winter and see what I can get for horsepower. Then if I want more I will decide whether to stroke it or try an LP head. It all comes down to how many ponies you want and what you wallet says you can spend. Right now my cost per horsepower is less than 4 dollars and that includes the carb modifications.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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