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Originally Posted by Hatterasguy
I have seen the cermic center of the plug blow out and leave the metal threads in the head. The engine in queston was an Atomic 4 with probably 20 year old heavly rusted plugs. Eventually the rust got them and pop.
I'd replace all the plugs in that engine asap.
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vac and try to suck out anything that might still be in the there. I see ACE Hardware sell various nozzle with adapter, some are I think would be thin enough to get into the plug hole. Also when you change the plugs put some anti seize compound on the treads only of the plug, if you get some on the electrode wipe if off, use a Q tip. Some folks use motor oil on the treads but I personally like anti seize. Most auto parts stores have little bags, one is enough for my 8 cylinder 450SLC.
Also, when you tighten the plugs hand tread them I use a rubber vacuum hose that is wide enought to slip down the top of the plug tighten them with that and then apply the socket wrench. Once they feel tight, turn the wrench 1/2 and extra turn just to crush the washer. You'll feel it crush.