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What are the best spark plugs for a Chevrolet Avalanche with a 5.3 and a supercharger?

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You need a set of colder spark plugs if you have a supercharger on it. Stay away from the platinum plugs since they are built to last long, but they are consider to be a high heat range plug, which is bad for any supercharged application. I would suggest some Denso Iridium spark plugs. The plug number is "IT20", this spark plug is made for your truck and is one heat range colder so it helps control the heat so you do not detonate. Iridium is a precious metal that has a melting point of 1,200F higher than platinum and it is able to conduct electricity better. Iridium plugs are 8 times stronger and 6 times harder than platinum. These plugs are better suited for performance and can still last up to 60,000 miles. I looked up the plug numbers for your truck so these should be the ones you need: Plug # IT20 Stock # 5326 Btw...these plugs are pre gapped so you do not have to re gap them. They gap these for force induction. AC also has some Iridium plugs however they are not as popular in ... more
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