Like the others said, at some point both valves seized in their guides. If you propose to use that cylinder head, be certain those valves move freely or else you will have two new pushrods just like those.
You also need to determine why it got so hot. I suggest taking the fan cover off and see if trash is plugging the cooling fins.
Be sure the rocker stands are tight on the head. Sometimes their bolt works loose and the pushrod just plain falls out.
Valve adjustment is .004-.006 for both intake and exhaust. It takes two 10mm wrenches. The way I do it: Loosen the nut and turn the bolt whichever direction adds more clearance. The bolt is offset so it works like a cam. Then turn the bolt in the opposite direction checking with a feeler gauge for the correct clearance. Tighten the nut and re-check the clearance. It may take several tries. (You usually get it close before you start pulling your hair out.)
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Today's Featured Article - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
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