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Old 06-16-2008   #8
Aurora40
 
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Join Date: May 2005
Location: Leesburg, VA
Posts: 2,704
Default Re: Spark Plug Heat Range

Quote:
Originally Posted by XfireZ51
The NGKs I had were the TR5IX Iridiums.
The NGK Iridium plug listed for the '93-95 is the TR55IX. I wonder if the TR5IX is just some older identifier? I believe one range colder is the TR65IX, and two is the TR75IX.

This is a tapered seat plug, which is not correct for the early LT5. However, if it's already in there, I wonder if you'll need to use tapered plugs from now on?
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