Need new plugs -- which ones, and who has a good price?

[1g1yy]

I just have a few intake + exhaust bolt-ons. Which plugs would be best, and who has the best price?
Thanks

 

[JBsC5]

I would stay with stock plugs. JMO

 

[DRTH VTR]

I believe that I have seen c4c5 make the same suggestion (stock). Paul, please correct me if this is wrong. When c4c5 talks, I listen.

 

[1g1yy]

Well, I bought the AC Delco Iridiums. Haven't installed them yet.

 

[JasonFRC]

I've had very good luck with NGK TR55 plugs. Most larger parts houses stock them. (Napa, Checker/Shucks/Kragen, Autozone). All are less than $2.00 each.

I like to use a Copper spark plug and change them often. (Once a year). I've never seen an advantage of using an Iridium plug on a near-stock car. They're quite costly as well. ($10.00 each or more).

 

[c4c5specialist]

Well, I bought the AC Delco Iridiums. Haven't installed them yet.

Hi there,
Thats perfect.
41-985 is what they should be and remember, DONT gap them.
Factory gap is .040 and they should be left that way.
If they are not gapped to that dimension, simply return the plug and ask for another.
Allthebest, c4c5

 

[Gorgon]

C4C5, what advantage do the Iridium plugs offer over the stock platinum (41-974) plugs?

JasonFRC, welcome to the CAC. I must say I really like your car.

Leon

 

[1g1yy]

Thanks everyone! I bought the AC Delco Iridiums from Fichtners at about $4.50 each. So that was not too bad. Even though my '99 coupe only has 21K miles, I have changed all the fluids and just wanted to go ahead and change the plugs so I wouldn't have to worry about that for a long time.

 

[c4c5specialist]

C4C5, what advantage do the Iridium plugs offer over the stock platinum (41-974) plugs?

JasonFRC, welcome to the CAC. I must say I really like your car.

Leon

Hi there,
From a durability standpoint, the Iridium does not get burned away in the fuel additives the way platinum sometimes has a tendency to do. That, to me, is the biggest advantage. All I have had to do in service, is to remove them to check them, add a drop of Mobil 1 to the threads and retorque to 11 ft lbs.
Also, the GM programming for the PCM is made to work the best with the revised gap of .040 and weird as it sounds, I got a 6 horse jump on a dyno run, just by changing them. At first I thought it was just BS, but they do work better for some reason.
Allthebest, c4c5

 

[JasonFRC]

Hi there,
From a durability standpoint, the Iridium does not get burned away in the fuel additives the way platinum sometimes has a tendency to do. That, to me, is the biggest advantage. All I have had to do in service, is to remove them to check them, add a drop of Mobil 1 to the threads and retorque to 11 ft lbs.
Also, the GM programming for the PCM is made to work the best with the revised gap of .040 and weird as it sounds, I got a 6 horse jump on a dyno run, just by changing them. At first I thought it was just BS, but they do work better for some reason.
Allthebest, c4c5

Excellent! Great information. Thanks c4c5!

I still have so much to learn about "domestic" cars.

and... Thanks for the kind words Leon!