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Discussion Starter #1
Can anyone tell me from expirence, what are the best spark plugs to be useing on my '99 GMC Sierra with a 4.8 engine in it. I've done a few mods to it, and was wondering about the plugs. AC Delco, Bosch, or is there something else out there to use?
 

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internet bigot®
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4,016 Posts
everyone has their own personal preference... i personally have found a smooth idle with NGK TR55's... they come pre gapped
 

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03 Tahoe
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1,364 Posts
If you want strict plug performance usually copper core plusg are best. Shorter life but really good plugs. Otherwise you'll probably get a lot of opinions....

I use NGK and AC Delco's personally.

Cameron
 

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Burning Rubber
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994 Posts
Autolite makes good quality plugs that come pre-gapped as well
 
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