Originally posted by Jim Bandy:
This is especially for SilverBullit. My car has NGK TR55IX Iridiums, put in when my SC was installed. Is this the right heat range? I also have a set of Autolite copper 764's. Are these the right plugs for a SC set-up?
TR55IX is the cross matched plug to the AWSF22FS Motorcraft Plug. AWSF32P is 1 step hotter and apparently was used on all models 99 and back. If you have noticed any problems with pinging or hesitation, you may want to consider going to a colder step plug. The only problem is NGK doesn't make one colder, Denso does though, if you're interested just send me an email, it's in my sig....Aloha, Micah
PS- Unfortunately I don't have an answer on the Autolite Plugs at this time...
