Motorcraft Sparkplugs

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:

riceharvester said:

I just tuned up my 350sbc. I used motorcraft sparkplugs and I can feel a power increase. Is this normal?

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It is if you WERE running Champions, otherwise it's just the fact that you gave it new plugs in place of old.