Okay so I swapped out the Stock Plugs for the Autolite 3923's... I checked the service manual to see the gap settings and it said for the V6 to gap them at .35 in...so I did that but after I put all the new plugs in just for $hit$ and Giggles I decided to check the gaping on the Stock plugs... now I know thatthe gap will increase over time through wear and tear...but my truck only has about 20k miles on it and the gap was at .48in... I mean thats .13in gap change in 20k... is it me or should I be worried???

 

most of the trucks that came from the factory were gapped incorrectly. one plug would correct at .040 and the one nexted to it would be .050 so if all the plugs were gapped the same at .048 then they were all installed wrong. check to see how truck runs over the next couple of days. if it is worse then gap then at .040 if it is better then you made a good choice.

 

So far the truck is runnin' nice... at first I didn't notice a diff but about a day later... (yesterday) I've noticed that it responds alot better when I push the gas... so I'm thinkin' I made the right choice...

 

Duh.

 

I just bought a set of Autolite Iridium XP plugs for my 3.7L Dakota and they came gapped at 0.035" which was apparently what they come from the factory according to Autolite, but when I called the dealer to ask what they should be gapped at I was told 0.042"? Anyone know the tolerance range for the gap on the spark plugs?

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.035 to .050 isnt going to be a noticable difference in our NA engines. I would argue that it doesnt matter at all. Just gap at dealer specs and dont think about it twice.

 

Stick with the service manual, the dealership didn't design your engine.

 

Thanks for all the input I think I'll go with the .035". I need one of those service manuals, that would help a lot! I think the Haynes one comes out in November.