Joined: Jul 2007
Location: St. Louis
Just to play devil's advocate:
It could be the engine is not original. I have a C-Code, and if I found a K-Code and stuck it in my car, it would be a HiPo, just not a factory hipo. It could be a K-code long block with the original C-code dress. Maybe.
People that aren't Mustang people like us will have different ideas about what HiPo means. Maybe to this PO, the warmed up 289 is Hipo because it is higher in performance than it was originally.
Or maybe, someone told him "hey man, you got a HiPo in your Mustang!" and he believed it, and he's just trying to be helpful.
Frankly, I think you are better off without the K-code. The mechanical cams are noisy and require very accurate adjustment of the valves. They are more of a high RPM engine, and, in my opinion, not fully taken advantage of by the average daily driver. Having something rare is great, but then you have something rare. I'd rather have something common (like a Mustang), and make it 'mine' (like my Mustang).
Again, not necessarily what I think happened or the most likely scenarios, but they certainly warrant consideration.
1966 289-2V C-4 Convertible. 2nd owner, resurrected rustbucket. Factory console and power top, conversion to P/B with dual res MC.
1990 GT 25th Anniversary 5.0 AOD Convertible. SOLD