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Hey all, I recently bought a 08 Silverado last month and I'm slowly getting everything serviced (when I find time), I pulled one of the spark plugs and it was worn so it's time for a tune up. The plug I pulled was a 41-985 and that's what I want to go back with. I had a 04 Silverado with a 5.3 and I put the 41-110's in it and as soon as I installed them the mpg dropped. I researched it and it seems lots of people had the same prob I did with the 110's. I know the 41-985's are discontinued but I'm wondering if anyone knows a place that still has any. Thanks!
 

· Supr Moderator AutoTech SS-Guru Mbr Extraordinaire
2015 High Country Duramax
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It's literally the same plug. Did you check the gap? Perhaps it was off a bit. You need to be careful though be cause they are fairly easy to break the top off of.
 
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