Oil return pipe offset?

[JayJay]

The two sealing surfaces on the oil return pipe have an offset because the sealing surface on the valve cover is farther away from the cylinder centerline than the sealing surface on the block. Does anyone know, or have a print that shows, what that offset is? I need to rebraze a leaking tube and would like to build a jig to hold it while I do so.

I'm concerned about the later (longer) oil return pipe. I've seen three numbers for this - A6645, A6647 and A6648.

Thanks a million.

JayJay