I don't know how it affects tractors, but years ago I bought a pickup that had been run on propane and the top end of the engine was shot with the valves and valve guides worn out. I kept one of the valves as a souvenir as I've never seen one so bad. The bottom end was like new. Was told it was a lack of lubrication for the valve guides that hurt the heads, but the clean burning helped the bottom end. I ended up replacing the heads rather than rebuilding the existing ones.
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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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