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All of the other plugs looked great. It has been a different cylinder each time it happened. I have 2 crate 350 mercruisers inboard. Temps run 180 do not hear any pinging. Looks like they start leaking around the crimp and then blow the ceramic part out. That is why they look burnt. Escaping...
This is the third spark plug that blew the porcelin out of it. Was not overheated as otherr people said in a previous thread. Looks hot due to it blowing exhaust gases by it for a period of time before it blew the end out. Plug was still in head and came right out. Only had about 50 hours on it...
