The BBM blocks have a drill-through on the top left
oil filter adapter bolt hole. It intersects the main
oil galley that runs the length of the block.
You will need to remove that bolt, put a little silicone in the hole, then silicone around the bolt head.
This is the kinda thing that we have to watch out for with aftermarket parts. It’s a very tiny hole that’s broken through, but with 70 psi behind it, it will leak quick.
This is why I prime the
oil pump on the stand, before the engine is started.