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This rather tired, two-piece spark plug was a real surprise. To make a long story short, we discovered the FRPP heads on our 4.6 use a fully threaded spark plug, unlike the half-threaded stock 4.6 plugs that someone put in our engine. Once we got that little number figured out after the OTC, our 4.6 ran considerably better!
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2016 Drag Week Day Four: 1,000 miles Done and a Quarter-Mile to Go!
