I'm in the middle of building a 4.1. The machinist is against trying to drill and tap for the turbo oil drain into the block because he was concerned of the block cracking while attempting to tap. I have read on these forums that the turbo oil drain can be brought down to the oil pan so I'd like to do the same. Can anyone share photos of this being done so I can use for reference? It would be greatly appreciated. Also, has anybody had a problem with Molnar Tech. rods? Thanks.