It's a Moline engine. To my knowledge MM never used the Detroit in their units; that is until White swallowed them and Oliver up. Oliver used them in some applications, and there's a time period toward where MM and Oliver's were definitely sharing design features so I may be mistaken on that.
I bought the 670 from a neighbor that had parked it "about a year ago" which was actually closer to ten years ago, because of a leaky radiator. We dragged it out of the bushes with his IH 806 and he insisted that we could get it going with a little fuel and a few laps around the field. I was skeptical, and rightfully so. After many hot laps, some attempts to get fuel to the pump and some disbelief on his part we made a deal and I towed it home.
The no fuel issue was multi faceted. About 2" of ice in the tank, filters plugged solid with sludge and rust, and you guessed it, a bad injector pump. The chicken or the egg thing comes into play here.
Unfortunately I never got any pictures of the unit in its burdock infested, almost final resting place. I will however post the "beginning" picture and at its current state. I still have several things to button up on it but it's a markedly different tractor than it was a year ago.
How do I post a picture? Is there a link somewhere that I'm overlooking?