the 8630 engine used a camshaft driven oil pump. it was their downfall. I think a few 8640's were built with the early engine but I believe most would have been updated when the 8630's were. check the engine serial #'s and parts but I don't think there will be any difference between an 8650 or 8640 engine
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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