Did you see any reason for the ex valve to loosen?
If the jamb nut was left loose, that is an obvious and correctable reason. But if the adjustment was still where it was set, and there was a major change in the lash setting, the change had to come from somewhere.
A bent pushrod is easy to determine, just spin it and watch for wobble.
Also check for a broken valve spring, or a sticking valve.
Another cause though can be a valve seat loose and falling out, holding the valve down. Sometimes they will go back in place temporarily then come out again.
Doing a compression test will show some loss if the seat is loose, total loss if it comes out.
As Janicholson said, check the distributor bushing, point condition and gap. Check for spark quality at the plugs.
There is a drain plug in the bottom of the carb. With the engine off, fuel valve open, pull the plug and catch the gas in a clean glass. The flow should be a solid stream, slow to a trickle as the bowl empties down, but continue to flow as a trickle, not stop or slow to a drip. Look at what was caught, check for water or trash. If contaminated, the tank may need to be cleaned, whatever was in the glass will also be in the carb.
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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