Which NGk and gap
This is a discussion on Which NGk and gap within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by Naaman I recently changed my plugs; I went to the parts store looking for TR55s, but the ...
06-05-2014, 08:12 PM #21
- Join Date
- Aug 2011
- 1998 camaro ss
06-06-2014, 12:35 AM #22
I don't know. I didn't mess with the gap. The ones I got are the TR5IX (iridium). Looking on NGK's website, they are the most fuel efficient option currently offered by NGK for 98 LS1s.
06-06-2014, 06:39 AM #23
I've had a few different plugs in the LS engines including platinum and the like, never noticed anything on mileage. Currently run an autolite copper core plug with a step colder on the heat range. No real difference in how the car runs in day to day driving. Still rock solid mpg numbers as always.
Iridium, platinum, copper, I think it just comes down to how often you care to change the plugs. I just prefer the copper because it's a better conductor of electricity. I don't mind changing at 30-40k, it takes 5+ years to put that much on the car anyway, lol.
06-06-2014, 05:31 PM #24
Well, with the last plugs, I would have a misfire if I suddenly let off the gas after WOT (you know that popping noise at the tailpipe?). I don't get that noise anymore since changing the plugs.
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