13' Ecoboost Spark Plugs
#12
Retired and loving it!
#13
It says in the owners manual I believe the range is .30 to .33 I replaced mine at 25k no miss fires or problems before had from the factory the motorcraft sp-534 all gap at .30 from the factory. Replaced with same plugs the old plugs had little signs of rust color stain near were the ceramic meets the metal base