I tap the bearing cap screw holes in the crankcase using a taper tap first, then a bottoming tap. The bottoming tap only buys me three more threads so I am not sure this extra step is worth it. The bearing caps will be held on by 2-56 screws.
Then I screw the bearing cap strip in place.
Then I drill and ream the final hole through the crankcase and bearing caps. I reamed the inside diameter of the bearing caps to .374″ as my Bronze bearings will have an OD of .375″.
Below is a picture of the bearing cap strip removed.
And finally I complete the machining from the bottom side of the crankcase.
You can see the pocket for the camshaft and I am pointing to one of the oil pan screw holes, these will be tapped 0-80. I also spot drilled the oil holes that will feed the main bearings.
In hindsight I should have left the bearing cap strip in place and machined the bearing caps at the same time that I machined the internal cavities.
Next I will machine out the cylinder water jacket from the top side. I machine the outside features very last as I like to have the outside square and flat as long as I can so I have something easy to clamp on to.