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Old 09-17-2015, 07:24 AM   #1
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Default Changing spark plugs in a 1989 gmc r3500 454 tbi

it about time to change the plugs and i was wondering what brand is best for my truck?it originally had ac delco but trying to save money i put champion copper plus in it and it ran fine but not as good as it used to so i was thinking i should go back to ac delco plugs.
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Old 09-17-2015, 04:25 PM   #2
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Originally Posted by wes104 View Post
it about time to change the plugs and i was wondering what brand is best for my truck?it originally had ac delco but trying to save money i put champion copper plus in it and it ran fine but not as good as it used to so i was thinking i should go back to ac delco plugs.
Go back to the AC-Delco plugs called for in your owners manual. In my experience Champions don't work well in GM products and are best suited for small engines found in lawn mowers and such.

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Old 09-17-2015, 06:03 PM   #3
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Agree , stay with a/c delco.
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