Tried to start a recent rebuild of my '56 Ford Fairlane, 292 Y block, but it would not start. Checked the plugs and they have oil on the ends as well as the threads. The head gaskets are brand new and installed correctly.... I'm guessing my rings are bad - they are the only thing I didn't replace in the build. Im going to take the heads off to see what's going on... Any other guesses as to why oil is on my plugs/threads?