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I would not drive the truck if the valves are not adjusted properly, and no an oil change will not effect the adjustment of the valves. The valves should have been adjusted with thee rebuild. I will say I don't know how one would know the valves are not adjusted by just looking at the engine. With that being said a new motorcycle engine requires a valve adjustment at 500 miles so maybe on a fresh rebuild you should have the valve clearance checked, I don't know I have never done a rebuild.
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