If it sat for 2 years with coolant in the cylinders, good chance the rings are stuck.
Will they free up? Maybe, probably not. But running for any length of time will do additional cylinder wall damage. Chances are they are already rust pitted.
Did the stop leak fix the head gasket or cracked head? Probably not.
It's impossible to tell the difference in a cracked head or a head gasket without tearing it down. Typical head gasket/cracked head symptoms are mystery coolant loss, blowing coolant out the radiator, overheating, exhaust steam even when warmed up, loss of power, missing, hard starting, as in a liquid locked cylinder, and coolant in the oil.
It's unusual for a block to crack from overheating, but letting one freeze will. If it sat with water and was exposed to sub freezing temps, good chance it did crack the block. Usually cracked blocks show from the outside, but not always.
What you might want to do, keep babying it along, watch the temperature closely, keep the settled water drained out of the oil by cracking the drain plug before starting it. Drive it around a bit, if you have any attachments, put them on, put it to some light work. Keep a journal of every problem you find. That way you can make a decision on what you want to accomplish, if it's feasible and in the budget.
What you don't want to do is spend a bunch of money on the engine only to find there are more problems, or put the engine back in and find it has to come right back out because there are other problems that could have been addressed while it was apart.
Before getting too deep into this, a shop manual will be a very wise investment. It will more than pay for itself in mistakes not made! If this is a diesel, be very meticulous with your repairs. Diesels are extremely unforgiving of shortcuts, they are money devouring monsters if disrespected!
Keep going though, you can do this! Ask all the questions you need, we're here to help!
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Today's Featured Article - Tuning-Up Your Tractor: Plugs & Compression Testing - by Curtis Von Fange. The engine seems to run rough. In the exhaust you can hear an occasion 'poofing' sound like somethings not firing on all cylinders. Under loaded conditions the tractor seems to lack power and it belches black smoke out of the exhaust. For some reason it just doesn't want to start up without cranking and cranking the starter. All these conditions can be signals that your unit is in need of a tune up. Ok, so what is involved in a tune up? You say, swap plugs and file the points....now tha
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