why was this thread moved...this was not a maintenance issue, i'm not lookin' for new plugs because i need a regular tune up. i am looking for a colder plug for better performance while running increased timing??
whatever. can anyone answer the question in the first post?
i too have used the app764's. went back to the motorcraft's. just like them better. i want to know how to discern the colder heat range plugs form the higher ones by reading the part #.
