Chevy 37; I'm not sure how cold it is where you are but it sounds like it's trying to freeze or expand, I mean you said it's sitting for 8 hours and no leaks. You might have a bad intake manifold Gasget letting anti freeze up thru a bolt hole and puddling on top of the intake. Do you have a heater hose that's in that area? I would look for pin holes first. If it's none of these, the intake could have a hair line crack in it. Let use know what you find. the last guy found it was comming up thru a bolt hole from a bad intake gasget that had rotted in between a water port and the bolt hole.


Vegas