Not Ranked
I magnified #4 up to 1000% and it sure looks like a crack----
A comment about nitrogen and air being mostly nitrogen----we breathe because of a build up of carbon dioxide in our res systems----a lung full of nitrogen will cause no co2 and you won't breathe---just go to sleep
The slime will go away with proper/adequate ventilation of the engine---it could be building up because of your two breathers. not the correct balance of flow and also the engine can be sucking in outside vapor on cool down---the ribbed covers agrevate that condition (top of motor cools quicker than bottom, alum quicker than iron)
you are pretty upset at this and it shows in your responses--
have you been a taster of coolant for very many years???
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