i felt like i was jacking somebody's thread so i deciding to just start one. tryin to decide what kind of spark plugs, im sure this is repetitive so i apologize for that. ive heard some good advice about using autolite 3923's but im just trying to get a bunch of opinions.

 

Autolites or Champion Truck Plugs

Stock number...no need to change heat ranges unless you've done some serious modding..or you drive your truck 100% city or 100% highway.

 

i have autolites... to tell you the truth i replaced my wires with 7.5mm ones and autolight plugs and a brass rotor.. and didnt feel a damn diffrence lol.. but then again i have a manual so its really hard to feel a diffrence.. but with the mods i've done so far (hypertech, k&n replacement filter, new plugs and wires) makes it a whole lot easier for me to keep up with my friend 2002 silverado HD with a 400 6.0L 2500.. but he still beats me pretty bad lol

 

aight well thanks for the advice

 

I just changed from Champion to Autolite 3923. Didn't really notice any change in power, but it does idle alot smoother.

 

im just a little cautious about leaving the stock plug type. the 3923 is a colder plug and im just not sure i want to mess with it. the autolite that comes up on its website for my truck has a number of 5224 i belive

 

I run Autolite 3923's, and have no complaints.

 

Running a colder plug will help with detonation. That and running a 180* thermostat. Carbon build up will raise the compression ratio of your cylinders, in turn making the combustion chamber hotter. Anything you can do to cool things down will help keep the air/fuel mixture from igniting before it is supposed to. I do agree that all of this is kind of like cold medicine though. You're just curing symptoms not the underlying problem.

Conversely, If you do not have a detonation problem and the compression ratio in your cylinders is correct, a cooler plug may foul quicker than usual. Especially with a 180* tstat.

 

I'm using Autolites and they seem to work fine. I had Champions in there before and also noticed no problem. I noticed that they were Champions when I pulled them out. I'd go with MSD wires and Autolite or Champion plugs.

 

Ok, I DO drive 100% in town short trips, maybe 3-5 miles at a time, to and from work..... thats about it, if going out for dinner or something ,its the same thing.... am CONSIDERING platinum plugs as I keep hearing they are good for that, something about they self clean faster after startup or something... I have the 5.9, so not TOO concerned with loosing a HP or two....