We changed that spark plug and the customer was happy with the magneto drop. That spark plug worked fine on a Champion spark plug bomb test.
Champions quiet redesign of their plugs to match Tempest made up my mind. It matters, and Champion is just trying to save face.
I always run champion platinum in the coil rail 4.0s. Sometimes engines are particular.
I've been using beru rs7 plugs without any issues.
You can get the champion version of the RS7 plugs for less than $20 a plug and they’re working great on my car!
These were actually alright spark plugs. The ceramic is a lot tougher than normal ceramic, and the electrode is larger. They were marketed as 'truck plugs', but they're really good in old tractors and farm equipment. They last forever.
I once had to use 99 cent Champion plugs in my car for a few months when I was flat broke. They worked fine but didn't last long.
BEWARE O’REILLY’S AUTO PARTS CHAMPION SPARK PLUGS ARE WEAK AND BREAK AT THREADS AFTER HAND TIGHTENING AND THEN TIGHTENING NOT EVEN A QUARTER INCH OF A TURN, WAY BEFORE THE TORQUE SPEC AND THEY TWIST RIGHT OFF N BREAK.
Like everyone has mentioned just go back with an ac delco plug. I ran champions and had Mis fires, none of them were gapped right out of the box.
Avoid Champions. Use NGK or Denso. Don't go cheap on plugs because the job is labour intensive.
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