thank you.
Can I replay this back to you with my own understanding of what I think you are saying to confirm it?
It sounds like:-
This is a heads off job which is a pain as mine doesn't actually need the heads off.
There are two heads so it has to be done on both sides?
The idea is to drill out the holes in the block that feeds oil to the oil feed holes in the head gaskets.
At a guess this would mean poking a wire down there to see how deep that hole goes and then drilling that deeply?
I am also guessing that the existing hole is narrower than the one in the head gasket and head so I suppose the drill size that I'm looking for is to drill it to the same size as the gallery in the head?
and thanks again.