If you feel something solid like a piston may be hitting a valve I would pull the head. You don't want to damage your engine. If the valve spring retainer groove is far enough down on the valve stem your local auto machine shop could probably grind the valve stems to the same length as the old valves. Hal PS: This was done on the flat head Ford engines so you could get enough clearance since you had no adjustment. I had an old Viking garden tractor and no adjustment on the valves you had to grind the stems and keep checking the clearance.
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Today's Featured Article - 12-Volt Conversions for 4-Cylinder Ford 2000 & 4000 Tractors - by Tommy Duvall. After two summers of having to park my old 1964 model 4000 gas 4 cyl. on a hill just in case the 6 volt system, for whatever reason, would not crank her, I decided to try the 12 volt conversion. After some research of convert or not, I decided to go ahead, the main reason being that this tractor was a working tractor, not a show tractor (yet). I did keep everything I replaced for the day I do want to restore her to showroom condition.
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