Spark plug advice...

[Cleandenali31]

Hi, I'm looking to put some new spark plugs in my 04 Denali. I was wondering what sparkplugs would work best. I believe what are in mine now are delco and usually when I changed sparkplugs I used autolite pplatinums but felt my gas mileage was actually decreasing. Any advice to some good bbenefitial spark plugs? And also how much should I gap them? Thanks.

 

[BigWheelinBubba]

I believe the OEM is Delco Iridium. Always go with what the owners manual advises. GM Engineers did a lot of research, they know what's best when it comes to spark plugs.

 

[donut slayer]

A/C delco iridiums.

 

[07Burb]

AC delco

 

[Goodinblack]

X10000 ^^^^^

 

[Chevrolado]

Yup.. What they said! AC Delcos are the way to go.

 

[livingez_123]

I have a new set of E3's in mine and couldn't be happier

 

[06GMC5.3L]

Stock ACs!


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[kschumake83]

I have a new set of E3's in mine and couldn't be happier

I put an e3 in a honda 5 HP engine and it ran like crap, and everyone who has ever ran a Honda small engine knows that they will run great with any plug you throw in it, doesn't matter if the plug is 10 steps colder or hotter. After that I wouldn't run those plugs in anything anymore.

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