[bnwhtlw]

@sewerman

Yes I learned this the hard way.  Ended up looking all over for ignition wrenches in 13mm to no avail.  Ended up having to grind down some cheapo wrenches from my local hardware store.

[Kevin Mahoney]

It took me years to discover that this task is a lot easier if you remove the stud that holds the tappet cover in place

[Foggy_Auggie]

bnwhtlw,
   A helpful hint when adjusting the valves.  I have found that the heads of a normal open ended wrench are a tight fit when trying to adjust.  I took two wrenches (forgot the exact sizes right now cause I,m at my office) and ground down the outer edges of the wrenches so that they fit in there.  It cuts way down on the cursing!

In my stock '06 tool kit the two open end wrenches fit the tappet adjusters perfectly as far as thickness.  They are a little thinner than standard open end wrenches.