I want to double check something. I've got a '99 F150 and I'm in the middle doing a coolant flush. Where are the drain plugs on the block. According to the Haynes book, they look square and are on top the oil pan. However, what I see are one 11mm 6 sided bolt (one on each side). The one on the driver's side looks burried behind the oil filter. How do you get that one off? But on the driver's side just on top of it (towards the top of the motor) is an recessed allen bolt - that's not it is it?

This is on a 5.4L.

 

on my 05 its a recessed allen bolt towards the back of the engine close to the oil pan

 

Is there just one? Or one on each side?

 

There's one on each side, but the second one is buried behind the engine mount I believe. At least it's buried where it's difficult to see or get to. The only way to get all the fluid out of that side is to get the plug out.