
I fitted them to a stock 4.6 V8 in a 2000 Ford Expedition. They went in like butter and have much better weather protection than the stock or some of the cheap ones at RockAuto. The truck has over 200,000 miles and runs like a dream. How much more spark than stock? It's hard to say, but with these and the new spark plugs, the truck is definitely solid. The truck fell face down at about 3800 rpm but accelerated sharply to 5 km. buy you!

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