Certainly no expert on anything, but I have tinkered with engines for many years.
I think I would try a mechanical temp gauge to see if coolant is actually heating up that fast. Sometimes electrical gauges go screwy.
I also think there is a test kit you can get at NAPA or other large auto stores to test coolant for combustion gasses. Using such a test would be a whole lot easier than removing the heads to test for bad head gaskets. If there is no evidence of combustion gasses in the coolant, I would bet that the head gaskets are OK.
It has been a long time since I touched a Chevy big block and I don"t remember if they have problems with air becoming trapped in the block. Some engines have a plug or plugs that you need to remove to get all the air out after you disturb the cooling system.
I also would wonder if somehow the LP carb was leaning out the air/fuel mixture which would make the engine run hot. No experience with LP systems.
Is there a computer involved? Or is it a simple electric shutdown switch if the temp reading gets too hot? Checking the wiring is a good idea, but breaks or partial breaks are not always apparent. Oil OK? I know that oil seems to last forever in an LP engine.
As someone else posted, I have had an impeller come loose on a water pump shaft, but once it came loose, I had no coolant flow, not intermittent heat readings. It got hot within a mile or so. I really doubt that is your problem.
So I would suggest verifying that the engine is REALLY getting overly hot and if it is I would check for combustion gasses in the coolant. Hope you can find the problem and it isn"t too expensive or hard to fix. Good luck!
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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