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I doubt you can really notice a difference in simply changing out spark plugs. Unless, your other plugs were in really bad shape. The increase in horsepower, if any, would be so small you probably won't notice. You may be running a hotter or colder plug which will effect the way the engine burns fuel, that may help the engine to run more efficient as well. My guess is your running a FORD plug in a Chevy motor, therefore it will run much stronger! :nono:
 
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