tooquick2beslo

I just changed my spark plugs today. I have a question. Does spark plug gap change after running a plug for a long time. I ran some TR6's for about 3 years and I changed my plugs today and it looks like they have more gap. They are almost at .045 instead of the .035 that they were gapped at. Its kind of weird.

Archangel79

I think the main reason the iridium plugs say "Do NOT Regap" on them is because that tiny ***, fragile little center electrode. It doesn't take much at all to snap that thing off. I haven't messed with the plugs in the Silvy yet. I was going to a colder plug in my old car so I could up the boost. I went to regap the iridium plugs...Sure as ****, I broke one of the center electrodes.

tooquick2beslo; Yes after running plugs for awhile the gap can increse as the electrodes wear.

v8

iTrader: (10)

small pair of needle nose pliers works great.

Quik

iTrader: (7)

when i did my swap i went with TR6 and gapped at .045 for intended use of spray

hog

I just pulled the platinums out of my Dads 1997 e cab shortbox, it seems as though some of the little "pucks" on the ground strap had worn off, thus increasing the plug gap a little.
I think this is the reason that folks dont recommend platinums in nitrous of forced induct applications, the pucks can become burn or get blown off.

In blown or nitrous apps, I have "heard" taht plugs should be changed every 10,000-20,000 miles, but I am not 100% sure on that 1, I guess that it would depend on how often you hit the switch or are in boost.

peace
Hog

jmproductions

Ok I changed my plugs from the NGK TR-55's (copper) to the OEM plug which is currently the AC Delco 41-985. Truck idles and runs noticeably better. Here is what I have learned about spark plugs in our NA motors recently:

1. According to a dealer technician: OEM plugs have been made by NGK (.060 gap, this is the one I was talking about earlier in the thread), Denso (? gap) and AC Delco (.040 gap). Which plugs your truck originally came with depends upon when it was made.

2. The current correct OEM plug is the AC Delco Iridium 41-985 for all V8s(4.8, 5.3 & 6.0) gapped at .040.

3. A copper plug (and many other brand platinums according to an expert) will not perform properly and should not be substituted for any of our OEM platinum and iridium plugs.

4. Plug construction is also a factor in determining proper gap.

5. Platinum and Iridium plugs should NEVER be regapped because there is only a small deposit of the rare metals on the electrode and it can be easily be damaged or rubbed off.

I learned this through painstaking research over the last few weeks, I hope it helps anyone interested. Obviously people running nitrous or FI have other issues to consider in determining which plug to use, for the rest of us I wouldn't consider using anything other than the AC Delco 41-985 or the NGK PZTR5A-15.

litreddevil

iTrader: (4)

i know the coils r different from the first 2 years of production to now on the 4.8,5.3,6.0 they have been the same since 01.i don't know if their is a different r not i know all the guts i used to work with all wanted the new style