It is a 66 427/425. I took the car out for the first test drive of the year -- everything seemed fine. When I got back I noticed a drop and small stream of oil on the top of the exhaust manifold at #4 cylinder. I checked the underside of the valve cover and it was dry. It is almost like someone took an eye dropper and place a large drop on the manifold. There was no stream from the valve cover. The stream went from the drop down. I recently replaced the oil dipstick and tube -- do you think it could be coming out of there. I have not checked the pcv valve yet.