best type? - What are the best type of plugs to run in my 2004 sierra 5.3l? I know there are a few diffrent types but i know some work ...

2004sierra · by **2004sierra** [OP] » Mar 29 2011, 1:02pm

What are the best type of plugs to run in my 2004 sierra 5.3l? I know there are a few diffrent types but i know some work better with certin vehicles. The only mods that i have are, headers, dual exauhst and k&n cold air.
Thanks

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EKinMN · by **EKinMN** » Mar 29 2011, 1:04pm

Hands down best plug is the AC/Delco irridium. I put them in my last truck, and was very pleased with the performance, and with how smoothly the truck idled.

I have heard good things about NGK as well, but why not stick with AC/Delco, since they are very good.

2004sierra · by **2004sierra** [OP] » Mar 29 2011, 1:06pm

i know there are the platnium plugs are they good and i know there is a few diffrent types of the platinums any input on them?

EKinMN · by **EKinMN** » Mar 29 2011, 1:07pm

Irridiums are the next step up from platinum (regardless of manufacturer). Avoid the Bosch, and anything that gives a claim to some miracle amount of horsepower or mileage.

chuck75 · by **chuck75** » Mar 29 2011, 1:08pm

ac delcos are a great plug. I recently put e3 in my 09 5.3 with the same mods you have and found that they are a really good plug. I also put them in the 05 colorado with the in line 5 and they made a very noticable diffrence with the higher milage.

2004sierra · by **2004sierra** [OP] » Mar 29 2011, 1:10pm

cool thanks man.

JCunningham · by **JCunningham** » Mar 30 2011, 6:45am

look up the reviews of the E3 plugs. not good

lzn197 · by **lzn197** » Mar 30 2011, 11:45am

Whatever plug was original equipment on your truck, put the EXACT same thing back in. That is what I am doing. GM put a LOT of Engineering into what your original plug was. I know. I lived it!

2004sierra · by **2004sierra** [OP] » Mar 30 2011, 12:03pm

lzn197 wrote:Whatever plug was original equipment on your truck, put the EXACT same thing back in. That is what I am doing. GM put a LOT of Engineering into what your original plug was. I know. I lived it!

That is a very good point! I just dident know if come gave you more mpg or hp?
Thanks everyone!

rdss · by **rdss** » Mar 30 2011, 12:20pm

Izn197, they also put a lot of engineering into the exhaust, intake, suspension, and tune and those are the first things that get thrown into a box in the attic!lol I do agree, unless you are increasing your spark and tune to use that hotter spark it is usually good to go with stock. Most of the souped up plugs are usually a gimmick and give negligible if any gains. I think indexing your stock plugs would have a better and cheaper advantage.

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best type? - What are the best type of plugs to run in my 2004 sierra 5.3l? I know there are a few diffrent types but i know some work ...

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