What would cause saturated oil to appear from my exhaust port of #2 cylinder. Was driving and engine started missing. I opened the hood and saw oil around exhaust manifold under #2 cylinder. Oil was not burned but was saturating the outside of exhaust manifold in one spot. New rebuild on engine .090 bore with new pistons. Ran fine until now.
Dan Colorado
Probably a mix of carbon, gas and maybe a bit of oil too. Since you say "new rebuild" I'm thinking that your head gasket needs to be re-torqued, (as they usually do after a short run-in time), and that it's currently blowing out the "oil" that you see on the manifold.
The dark gooey substance is not unusual by itself. You'll see similar leaking past a spark plug with bad threads or a head bolt that has combustion gases leaking by it, (due to a leaking head gasket).
My thought is that the exhaust manifold gasket has a little leak there AND you are running your carb/fuel mixture just a bit too rich.
If you are running over-rich enough that dampness would show at a manifold gasket leak, then you are probably running over-rich enough that you will probably foul the plugs pretty soon too...