I'm not saying this is it but, last year my 1800 gas had a little knock like that. It didn't sound like it was coming from a bearing in the bottom but it wasn't in the head. Turned out to be wrist pin bushings on two rods. From what I've read they can be a common problem as they were brass and after time ware out. Hope it helps
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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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