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Originally Posted by Aurora40
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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i cked with corey and he said you could go back and forth . i have used the ngk tapered in my car for over a year then when i tried the e 3 and found they were the old style with the metal gasket . and have had no ill effects at all . hope this helps