mustang88_cars
Well-Known Member
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- #1
I have read plenty of information in regardes to older Gen 3 coyotes coming with heat range 7 plugs from the factory then Ford changing to heat range 6 plugs after 2021 and making it a backwards to 2018 recommendation
So what’s the consensus? Use the heat range 6 SP-589 or the heat range 7 sp-548?
For context I purchased an 85 Mustang GT Gen 3 coyote swapped car with a CAI, IMRC lockouts, and BBK long tubes. It wasn’t tuned very well if at all. I got it tuned and just want to change the plugs for peace of mind after running the car on that crappy tune.
Obligatory pics
So what’s the consensus? Use the heat range 6 SP-589 or the heat range 7 sp-548?
For context I purchased an 85 Mustang GT Gen 3 coyote swapped car with a CAI, IMRC lockouts, and BBK long tubes. It wasn’t tuned very well if at all. I got it tuned and just want to change the plugs for peace of mind after running the car on that crappy tune.
Obligatory pics
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