Colder spark plugs for 3x00 Engines?

[blackbombshell95]

Do they exist? Where can I find some? I'm lookin for 1 stage colder currently.

[Mars]

R42LTS <-- 2 steps colder than stock.

delco don't make R43's. (which would be one step colder)

[blackbombshell95]

I wonder how 2 stages colder would handle with no modification?
I'm surprised they are so cheap at $1.06 a plug. How good can a dollar spark plug be?

[xtremesunfire]

i probley can get them for 85 cents at work

[RacerX11]

I have run $1 AC Delco plugs for years with no problems. I guess the more important question should be, if $1 plugs run fine, why would you waste money on more expensive ones?

Back to the original request, why are you wanting colder plugs?

[AaronGTR]

I use denso iridium IT20's. Those are one heat range colder... stock is an IT22. That's just for denso iridiums. Other kinds/brands I don't know. It can be hard to find sometimes. Almost everyone has an application guide that tells you what plugs to use for stock range on your car, but they never tell you what is hotter/colder. Best bet is to find the plug style/type you like and get a part number then call up the manufacturer and ask them what is colder. Thats what I had to do.

You can also try here. http://www.clubplug.net/ They carry just about everything and they should be able to tell you more technical detail and give heat ranges if you call or email them.

[blackbombshell95]

I'm wanting colder plugs for my zex kit plus my new engine that i'm putting in soon

[JMo60]

im just using the turbo grand prix plugs in my 3400 with spray, works great.. i do believe that they are the 42's

[gboogie99]

can you tell by looking at a plug whether it is colder ?

[JMo60]

yeah you look at the number on the side of it... colder plugs usually have a shorter center electrode. ( less exposed metal out of the ceramic)

[xonelith]

I've used Autolite 104's (I think they are 1.5 ranges colder), but have pretty much found the NGK TR6's (2 ranges colder) work a little better for my application. These are both copper plugs.