Re: Stuck spark plug
If a short reach plug is correct for your engine (which should be right for a 1962 truck) while the plugs you found in the engine compartment are long reach, it sounds like your problem could be a long reach plug in a short reach hole, with carbon burned onto the exposed threads. This is probably better news than cross threading (unless the longer plug has damaged the piston, and/or the piston has damaged the end of the plug - other members probably know if this is possible) and gives more hope to the idea of working the plug back and forth to gradually wear off the carbon without damaging all the threads in the head. And it also gives hope to using penetrating oil that should be able to run down the threads of an even slightly loosened plug to soften the carbon. But if you only have 3/8 inch of threads in the head, a 3/4 inch plug will need to be half way (another 3/8 inch) out before the carbon is gone. Again, good luck. This will probably not be the only time that patience may pay off in not creating a bigger problem while working on the engine or the truck. I have also learned that many replacement parts are hard to find, so it is better not to create a need for them.
JRMunn
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