Not Ranked
I have a KC engine. Mine also had a by-pass blocked. This was not installed by KC and I would put in the bypass hose ASAP. I was about at the same point of my engine break-in where you are and the rubber cap failed blowing coolant ALL OVER. There is a huge amount of PSI built up on the back side of that thing. It is suppose to allow a controlled amount of flow to so you don't get surges of water blasting by at different temps.
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