Hey, I've changed out one of those!! Admittedly, it was a completely unrelated car and engine...
Jerry, those little suckers are 'maybe' about 3" OAL, and the hex head can be anywhere from 3/4" to 1". Like Griff said, they can be a wooly booger to find because it's kind of like trying to find a particular rivet on the Golden Gate Bridge - especially if the wire has come loose. (which is a pretty good analogy, considering most of that little basket-case is inside the engine block!)
I tried hunting it up, but the Haynes manual is relatively useless. Good luck!!
Oh hey, Griff... You mentioned getting 10 years out of the battery on your 1990 E-150? In 2009 the battery in my wife's 1992 Ford F-150 SWB 4X4 'gave up the ghost'. I went and picked up a new battery, and when I pulled the old one out I thought "You know, that battery tray looks awfully clean and shiny..." Looked at the old battery and turns out it was Motorcraft. 17 years on a factory original battery!
How often does something like THAT happen?!? :-D
