Re: HELP!!! Oil leak on REBUILT 351M!!
The first place I would check is the valve cover. When I rebuilt my heads and put everything back together on my '91 5.0 Bronco, I noticed that I had a tremendous oil leak from the back of the engine.
I was so damn worried that I did not set the head gaskets right, but it ended up that my valve cover gaskets were not sealing. It was because the metal/rubber valve cover gaskets did not fit perfectly under the valve cover lips.
Anyway, I would check the valve cover for the leaky problem.
Hope that was your problem area.