Spark plug BRISK or Motorcraft

I also put Motorcraft new plugs back in. Truck is happy. I'm happy.

I have about 30k on my plugs (Motorcraft OE). I've no problem buying them again as they've held up great

I use a Brisk n17yc.

Get a Brisk spark plug. Worked for me

Been using the cheaper Brisk brand and never had an issue for 20k miles.

Heat Exchanger, also Brisk racing spark plugs I gapped mine to 0.026”.

switched to the back to the motorcraft spark plugs $15 a piece fixed it for a while

I heard from an old ford mechanic once that ford designed their ignition system around the motor craft plugs and no other brand plug will run right if installed. Since then only motorcraft or autolite in my fords.

Brisk are fine. You have to check them about every 5,000 miles. And change out sooner than other brands.

Iridium plugs suck on fords.