Diagnosing Engine after Overheating

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Might as well go ahead and pull the head...it's really not a terrific amount of work, you will have to do it anyway sounds like. Then, a physical inspection of the head, piston tops, and valves should tell the tale..
 
The next thing I would do is check the valve adjustment, if they are tight the compression may come up when adjusted.

But that's probably a long shot, my guess is that it got really hot cooking the rings. When the rings get extremely overheated the temper is lost, then they don't have any spring tension holding them tight to the cylinder wall. Motors that get that hot most of the time have other issues, warped head, piston issues, etc.:frown: :frown:
 
On the advice of the two mechanic buddies, I just swaped in a new long block. I plan on conducting an autopsy of the old engine and head when the weather gets better. It looks like the headgasket of the old engine bit the dust, but I can't claim if that was a cause or result at this point.
 
i have a 1990 toyota pickup 3.0 L v6 automatic EFI. we replaced the thermostat in it and got an air pocket in it so it got hot. we shut it off and now that it has cooled down it wont start. there is a clicking noise coming from under the dash near the ECU. i can also hear a faint whine when i hold the key over. could this be a relay the ECU or the starter? it was just running until we shut it off. now nothing
 
i have a 1990 toyota pickup 3.0 L v6 automatic EFI. we replaced the thermostat in it and got an air pocket in it so it got hot. we shut it off and now that it has cooled down it wont start. there is a clicking noise coming from under the dash near the ECU. i can also hear a faint whine when i hold the key over. could this be a relay the ECU or the starter? it was just running until we shut it off. now nothing

Sounds like the starter. Try tapping on the outside of the housing good with an extension or something and then try it.
 
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