I've had the head off 5 or 6 times now trying to figure this out. There is nothing obvious I can see between 3/4.
Yes I know it's blowing my mind how it will hold pressure. It's holding pressure today, but as soon as it's running it pulls so much coolant in. I could see a crack expanding with heat but this is no little leak that slowly burns off coolant.. it fills the cylinder within seconds of running.
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