Any input on reading plugs? Stock plugs @ 54,0000 (CYFS12Y) Gap still @ .052 using feeler gauges.
Motorcraft or NGK?
18 manifold, GT 350 cold air/throttle body, Hp tuners.
Darn internet has me double guessing my purchase!
Any one with a picture of a genuine NGK iridium ltr6ix-11 spark plug?
I may have received a counterfeit set.
Taper shoulder has NGK I I I I I I I LTR6IX I I I I
HEX has U1Z8 stamped on them.