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Could have water (coolant) on it, or oil. If you are worried about a blown head gasket, be less concerned about spark plugs and check to see if coolant is in your crankcase, (motor oil) or vice versa.....oil in your radiator. It is possible for an engine to become hydrolocked, or seized, from coolant in a cylinder with both valves closed. But even if the engine is not seized pull spark plugs to see if there is coolant in cylinder. If there is, bad news. Do a compression check also............David

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Q: What does a spark plug look like on blown head gasket?
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