I wouldn't bet on anything without more info. How did it get on top. Spray up from somewhere? Pump gasket? Hose? Coolant on top doesn't tell me anything happened inside.
Hoses tight, pump gasket is good, hasn’t even fired yet. I honestly do not know how it’s getting on top. Intake was put on with new gaskets and A sealant, like all the others I’ve done. I’m thinking a warped intake perhaps?