Quote:
Originally Posted by DanEC
In my opinion both are a concern with a steel bolt threaded into an aluminum part. But for most of these cars that haven't been bolted together for 20 or 30 years - galling is probably the biggest concern. In addition to using anti-seize on any bolt into aluminum I have another rule of my own, which is never to remove a sparkplug or other torqued fastener in aluminum on a hot engine. I'm sure people do it all the time and manage to get away with it but I think that is how most plug holes get stripped in aluminum cylinder heads.
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Yes, totally agree with this. If you want to do some interesting reading, Google changing and correcting Fords better idea for 2005 Mustang and up 4.6 V-8 spark plugs. Just did this very very carefully and did not break one plug. the dealer gets good bucks to do this because it is a nightmare and your heart is in your mouth the whole time. They are actually told to explain to the customer that a few plugs are most likely to break in one of three places. i researched this to death before I attempted it. Also lucky the car has only 55K on it.
The point is, they stress only on COLD ENGINE!!!!