I'm not a plug expert, but it is my understanding that for a Ford, Autolite xx25 is the stock heat range, 24's are one step colder. Unfortunately Autolite doesn't make a 3925. So I guess you should look into Motorcraft or NGK's.
------------------
Craig
Supercharged 93 GT
Basically stock 93 Cobra
"I drive way too fast to worry about cholesterol!"
|