I couldn't see a "4G3x" in the usual spot near the starter (but it's pretty grungy down there). Seems to have "ZB-something" cast into the block on the exhaust side.
Do the bulges down the sides of the block house balance shafts or something ? Don't recall seeing anything similar before .... but I am totally unfamiliar with the belt-drive motors.
![Image](http://i135.photobucket.com/albums/q121/gallax/IMG_0295.jpg)
![Image](http://i135.photobucket.com/albums/q121/gallax/IMG_0294.jpg)
![Image](http://i135.photobucket.com/albums/q121/gallax/IMG_0297.jpg)