Check on the ford six site (www.fordsix.com). There's a few guys who've been looking for one for a long time. I guess they're hard to find. From what I can find in the manuals, they were mostly found in COE trucks, usually the F550 & 650. Don't know much more than that. Haven't been able to find out when ford first started making it either. A few years ago I noticed an old ford ('mid-late 50's) farm truck near my hometown, I think an F650, that has an I6 in it. Unfortunately I don't know enough about ford's first OHV 6 to be able to identify it. Sounds like an interesting motor though. Take care,
Edwin
'63 & '65 red tudors
'84 F150 4x4
