Thank you for the quick response. The timing cover backplate hides the source of the leak even with a mirror and light, but you're right it could be the cylinder head, is there an oilway near the front feeding the camshaft? I have not had the head off one of those engines. I have changed the valve cover gasket twice and the leak hasn't altered so I don't think it's the cover. A second query, the oil pressure I think, used to be about 60 psi, I changed the oil cooler pipes two or three years ago and I noticed that it doesn't come above 30 psi warm now. The green book says the relief valve spring should be 49mm, this one measures 52.50mm, do you have any ideas what I could check for?
Thank you.
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