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we purchased a tractor with a piece the size of a slice of bread come out the side of the block. 7"x4" we had the piece in 2 halves and MIG wleded it back in. its a cheap option and sves a lot of work. you must really gring a bevel on the block and the broken piece then crank the welder up to about 180 amps and take it with care.
I don't know which country you are in but Eagle Tractor Parts was advertising a block for a 5211 on E Bay. I think this will fit yours but I'm sure someone will correct me if not.
Here is the link direct to Eagle Tractor Parts 5211 Block http://cgi.ebay.com/ZETOR-5211-ENGINE-BLOCK_W0QQitemZ7598044826QQihZ002QQcategoryZ11756QQtcZphotoQQcmdZViewItem
If you choose to weld, weld a half inch at a time, with at least a minute interval, and weld in different spots each time.
Then use an angle grinder to smoothen up the surface, which slows down the cooling process and reduces crack risks.
I welded a top link bracket of a 2011 this way, and it still does fine.