I finally had my freshly rebuilt engine hooked up and I turned it over a few times to get the oil pressure up before sticking the spark plugs in. Then, to my horror, I saw coolant come from my number 3 plug hole! I dried it off and kept turning it over and didn't see any more. My optimism says to try to start the truck with 7 cylinders hoping the heat will seal the gasket and then I can stick the 8th spark plug in. There was a coolant leak on top of my intake manifold earlier this week and I let the fluid sit there. Is it possible that it leaked through the valve cover (grease sealed, cork gasket) and into number 3? Am I doomed?