Yeah I am hoping that is not the case. It did sit for a while, but was in a garage. It does have antifreeze in it so I would hope it didnt crack but who knows. I am going to try pressurizing the cooling system like suggested.
There isn't any way the valve being stuck open could have let coolant somehow back into the intake manifold when I was cranking the motor over? Ive never worked on a flathead motor so not 100% sure whats going on under the head.
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