I've got some new plugs Motorcraft #SP-504 AGSF34FM34 and the threads are longer than the old Motorcraft platnums. Maybe 1/4" longer. I've looked at O'rielly and evey other parts house. Finally I ordered some from Bill at SuperCoupePerformace and they're no dirrerant. Question is, have any of you used them and are there any issues as far as them going deeper into the head?
Thank you very much.
Thank you very much.