Damn Mike
Here's my guess, from what you have said.
1. The stopleak crap you put in there made it's way to the head and blocked a water jacket. This made an air pocket in the head. The air gets cold and cracks the head.
2. Maybe you just didn't have enough antifreeze in the motor
Check the back of the head for leaks. Pop you radiator cap and see what's in there or drain your radiator and check for oil. It may be the headgasket too.








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