As stated above, it's the Ural 4320. THe kit is the ex-OmegaK casting, and is supposed to be quite good. I have it as part of ICM's Serbian forces set (the one towing the bs100 field gun). I haven't built it yet, and probably won't for a while, but I've heard many good things. One thing you might watch out for is the fit and allignment of the truck frame, as I've heard that if this is not exact, fitting the engine might be a problem.
There are a couple of reviews available online, but you can check out the one posted on the Alanger website.