Spark Plug Gap - Not As Easy As You Think

[Robert Arco]

Okay experts - I have searched and searched for the correct spark plug gap for my 2008 Mustang GT 4.6L. It was made Dec. of 2007 and has the newer 12mm plugs and not the breakable plugs...UNFORTUNATELY the owners manual must be a tad older because it says " .040 - .050" and "Spark plug gap is not adjustable". Yeah, maybe for pre-correction but the 12mm are CERTAINLY gappable.

Thing is I have searched and searched - even put in 2009 as the year just to see...NOTHING or its all over the board...

Anyone know the range for this for certain ? God forbid Ford tells me...thanks

 

[Bullitt347]

I gapped mine at .045 in the 08 Bullitt.