Replies

Does he keep up on tech?

“Oh, once the spark plug hole strips, you have to throw away the head!”
You haven’t had to do that since the 1980s. Here are instructions from one of the biggest manufacturers of that type of repair kit, complete with video at link.

http://www.timesert.com/html/howtosp.html

Ford may have replaced the motor out of goodwill and customer service because if the techs at the dealership were incompetent enough to screw up 8 plugs they probably weren’t the kind of people you want installing Timeserts.

Also “he builds race cars, he knows what he’s doing” - yeah, *I* build race cars for fun and I know other people that do. Unless someone works for Penske or one of the big houses/names, that doesn’t exactly make them authoritative or their statements definitive. They’re just more experienced than the average joe, not engine gods.