This cover is a N.O.S. cover (not a repro or pattern as the Brits call them) I've had in stock for many years.
I don't have a used cover for either engine, so I didn't have one that was known good to start with.
Once I ground about 1/16th from the inside of the case, problem solved.
You may have just "fixed it" so the next guy will wonder who worked on this?
What is your engine series you are assembling and from what series is your NOS cover? Are they even normally compatible?NHT timing chest covers
Are you saying you have a MKIII engine MKIII oil pump with MKIII style hardware with MKIII timing cover and gasket and there was a "crash" in the blue dye?