No, the pictured engine is not a Detroit.
I did a lot of work on various Detroit's during the 70's & 80'.
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Defo a UD/Nissan 3 pot two stroker, and here's one in action!
http://m.youtube.com/watch?v=bumDUoB...%3DbumDUoBBFho
that is the one, still can not fined any actual info on them, where to get parts if possable, manual specks etc etc