Certainly possible, but at some stage I am likely to trash a crank or four(etc.), so at this stage I rather keep the cost of the crank work down to the standard clean up of the bearing surfaces and ensuring it's still neutrally balanced.

I think I will re-route the oil drain backs. Looking at the block again, I only have to run two external lines and tap into one of them from the oil filler cavity. I check my taps and the hole size is perfect for a 3/8th NPT tap. I think the returns are 9/16th and the tap asks for a 37/64 bit, which 36/64 reduces to 9/16, so plenty of meat to tap into.



I didn't have a 3/8's plug on hand, but this adapter shows it'll work well. I'd probably use some loc-tite on it and likely drill the tiniest of holes in the the plug just so oil doesn't permanently backup in there and cook.



I need to get a 37/64 or 9/16 drill bit to tap the block externally at the base of the returns and to be able to thread the appropriately sized fittings to it. Then I'll drill and tap corresponding fittings to the oil fill cavity.