spark plugs
if the guy was an honest mechanic and had actually taken the plugs out of the engine he may have seen discolouration on the plug electrodes, but it would be unusal for them all to be the same, head gaskets usually go in 1 or a couple of places very unusal for the entire thing to fail cos then you get oil in water system, water in oil system and both oil and water in the bores making lots of smoke if it actually runs.
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