Originally Posted by Brabs_Weather
I know this is gonna open some scars, but RED how are you spark plugs gapped. FB has his at .055. I did check mine and they are .038-.040. I also noticed that the spark plug that was listed SP-522 and now has SP-535 too. I put my VIN on Fordparts.com and it now says sp-535 for the TI. Does anyone know why there are 2 plugs listed.
Never mind the two spark plug have to do with Build dates.
SP-535 BUILT after: 6/1/2011
SP-535 BUILT before: 5/31/2011
It may have to do with the e85 compatibility. Late builds all comply with e85.