There's a conflict (LG 170 vs. RG 225) between two databases on that number. What stamping do you find on the engine ID pad (block deck surface, facing the sky, front of RH side of engine, below № 1 spark plug, just inboard of alternator/coil mount bracket)?
Odd stamping. How sure are you that these are exactly and all of the characters stamped? What is this block's casting number (in the same location as you found 2205857 on the other block)?
