Had the same thing happen to me after I had the engine in my B running up to temp a few times.A little bit of oil ran down the left side of the engine block from the corner of the head gasket area behind the intake breather. It seemed to stop now. I was going to retorque the head bolts just to play it safe, but a few AC folks said that it wouldn't be neccessary. I think it might have been from the oil I put on the head bolt threads when I was installing the head and torquing the bolts down. That's the only thing I could think of, and it only seemed to come out that one corner.....(?) Steve B.