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Extraction is usually successful if the TSB is followed closely. That means using the correct solvent and letting it soak the correct time, etc. Those that have broken plugs can usually extract them with the special tools. It should be rare that anyone has to remove a head. Also, I think it is important that gas with a good detergent is used. I have also seen some posting that they broke a plug after running p1 octane. Little did they realize they were doing more harm than good when the engine was tuned for 87.
Mine were changed at the dealer at 65,500 miles and all came out without a problem. They still looked new and had many miles left in them. My dealer follows the TSB and have had one broken plug, and it was on a truck that had over 100,000 miles on it.
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Jim
Flowmaster 40, K&N dropin, Tint, Roush wheels, 305/50/20s
Edge Evo with PHP custom tunes, GF 2" shackles
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