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Spark plugs


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The most reliable ones in our engines from 87-98 are the traditional champion copper plugs part number 4412 which are discontinued so now they're just 412. For the 99+ group alot of people use NGK iridium I believe due to the changes in the ignition system. These 4.0's we have prefer to be old fashioned and these new fancy v power, +2, +4, all that causes problems with engines resulting in detonation, knock, and other issues as well.

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