It sounds like you already tried what the previous messages tell you to do,
even what was mentioned in previous threads (file & visegrips)
Are your EZ-outs the square tapered ones or the left threaded spiral ones.
The left threaded spiral ones might expand the thin wall of the plug to much even though they are a better tool.
I would try heating up the head as mentioned (running or flame) and try again with a bolt/screw extractor.
Last resort would be drilling when piston is at top of compression stroke (all valves closed in cylinder. High pressure blow out, then rinse out with water oil or something liquid and blow out again. You don't want metal shavings in there.
Good Luck
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EJO now a 1993 944T 193K; ex '65 123S; ex '75 245; and ex '81 242GT; also Chrysler 2002 T&C and 2006 MINI Cooper
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