It dawned on me while I was working on the Grand Marquis yesterday that I hadn't posted a picture of the repair kit I was using. Let me remedy that now.
There's a step using a rubber stopper and compressed air to ensure that the valves are closed to keep the shavings in the cylinder. Once the boring and tapping were done, I spent about 5 minutes blowing compressed air into the cylinder to clear all of the aluminum shavings. At least I hope I got them all, or at least 99.99% of them.
Anyway, all 8 cylinders now have threaded steel sleeves with full contact with all the threads on the plugs instead of the 2 or 3 threads from the original design. If it throws a plug now, that will be the least of my troubles at that point.
Next time it breaks it's either going to the junk yard or being sold for parts.
Until next time, be good, and if you can't be good, be sneaky.
Wayne