Larry,
Yours must have had a different casting number?
I don't know, I am certainly no expert but your Canada/Mexico (Chile in this case) theory sounds plausible to me.
![blush blush](/ubbthreads/images/graemlins/default/blush.gif)
The other thing that is interesting that you probably understand better than me, is how the 292 head relates to the 194 block? And/or how the 194 head relates to the 292 block. In this forum there's a guy that seemed to have that combination.
If I ask too many questions, ignore me.