Just curious what is the throttle body bore now ? I would not think a tractor engine would be turning enough rpm to need a very big throttle bore , as generally smaller bore means higher velocity for the intake charge and better low end torque . A bigger bore throttle body would definitely allow higher HP for a high rpm engine , but could mean less low end lugging power . I am curious to see how this aspect plays out in your project. The Zenith carbs used in the old F-Series Farmalls had several different venturis for use depending on application and I have wondered about swapping different ones in the same tractor to see the results.
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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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