This is topic Spark Plug Heat range Help in forum Tech Talk at Northern California Ford Owners  .


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Posted by 1svtcobra (Member # 1352) on :
 
I need a plug # for 2 heat ranges colder for my 98 cobra. They need to be copper plugs. I prefer NGK. open for any suguestions though.

THANKS!
 

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Posted by 93PONY (Member # 60) on :
 
TR5's are stock in 5.0's. TR55's in 93 Cobras.
I use TR6's in w/my TTs & it works great. Next step up would be TR7's, etc. Whatever the factory replacement plug is, just go up 2 numbers.

NGK TR5
TR55
TR6
TR7
......
 

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