ACDelco GM Original Equipment 41-103 Iridium Spark Plug

It fits perfectly in my 2008 Chevrolet Colorado truck, good quality !!!!

Oem replacement reliability.

As described. Right fit, right price, right purchase!

Great quality from original equipment manufacturer. I always look for AC Delco parts 1st to guarantee that I’m getting the best part for my Chevrolets. Easy to install and improved the rough start issue I was having. If I have to replace one, I go ahead and replace them all at once for the best results.

The 4.2 LS "Vortec" inline six motor really likes these. That's in trailblazer, envoy, and other common early 2000s GMC vehicles. I suggest pulling one of your plugs first to be sure you're getting the right one. These motors are quite particular about the plugs- I've seen other brands like Champion, etc not work correctly. NGKs are viable alternatives, however.

I bought 6 of these and the mfg says to NOT set the gap on iridium plugs. They're set at the factory. BS. After installing them and trusting they were gapped correctly at the factory, I had a random misfire. Turns out one plug gap was so bad it was almost closed. Otherwise, the car runs great and gets better mpg over the old plugs.

These are the OE replacements for a 02 Chevy Trailblazer Ext. Performed a tune up and these plugs are great. They’re already gapped however I always check the gap! My wife’s SUV runs great!

2004 GMC Envoy XUV . I tried to go cheaper but i ended up having to get these as the correct replacemet part. This is somewhat complicated due to the original plug 41-981 Platinum plug was discontinued and replaced with these 41-103 plug was hard to get to so i think whatever mechanic did the first tune up left the original in there. So theres alot of plugs that wont fit right that will say they are correct wont fire or are not the correct quality and the first plugs i ordered did not even fire. So In Short In This Case I Would not try to go cheap and Go With These AC Delco plugs they fired immeditely and correctly.