The owner is using it as almost a daily driver. Loves to take it to his company's work sites and move equipment from place to place. Saw it with a 4000 lb lawnmower on the bed and the receiver hitch has a pintle hitch in it.
Got a call late Saturday that it had a problem. Running rough, no power, lots of noise, wouldn't idle.
bottom line, it had dropped #4 intake valve.
Trailered it down today and confirmed o compression in 4, removed valve cover and found the spring, retainer, etc laying on the head and the valve banging up and down on top of the piston.
Have no idea what caused it. All of the parts are a bit banged up and the pushrod has fallen down in the side cover. The valve guide is wiped out.
The odd part (more odd than that) is that the timing (at least ignition but possibly cam) is retarded.
I tied a wire around the valve stem (not bent) and tied it into the closed position, took the spark wire off and ran the engine. Instead of running like an engine with a miss, it ran badly and sounded very retarded.
More tomorrow.
