I have a 2008 explorer with a 4.6 engine. What date code did ford change to the newer style spark plugs, one piece. The tag on the valve cover said the engine build date is 220408. I think this is May 22nd of 2008. part number of the engine is 7S302AC.
Does this engine have the 2 piece or the one piece plugs.

 

Compare your door pillar sticker build date to your valve cover. 4.6L 3V before 11/30/07
http://www.revbase.com/BBBMotor/TSb/...dPdf?id=142690
BBB Industries - TSB's & Wiring Diagrams

Brown coil boots are used on the newer 3V heads. Black coil boots are used with the older design heads with the two piece plugs.
4.6l 3v Spark Plug Removal Instructions | Ford Explorer and Ford Ranger Forums - Serious Explorations

 

Thank You, as it turned out I did have the brown boots and the plug where not the 2 piece.
The gap on the OLD plugs with 104000 miles was over 70 thousands, Wow