Inserted engines don't need to be pressurized to last. I have built many with the original oiling and have had no problems. I am a firm believer that any competent rebuilder would never do any machine work to the pan rails or the main cap seats. These areas are machined at the same time and are how the crank is located to the cam. Changing this could make the relationship incorrect and cause undue wear to the cam or mains or the gears.
Just my experienced opinion.
I don't agree with that, James. If you have a pan rail that is warped by a few thousandths, and many are, you can not surface the block correctly, as the block will teeter, or will pull down at an incorrect angle. Also the same reason for the boring of the cylinders., they have to be with the center line with the crank. Vern has done two Model T's, and one Model A already this year, buy surfacing the pan rails, along with the three Mains part line. You just can't leave them like that.
This does not affect the center distance what so ever. The first thing you should do is , the boring bar has to be set dead center between the two main bolt holes, on no. 1, and 3. That measurement should never again move, and if it does, it should be, redone, and kept there. The next step the boring bar should now ONLY be moved up and down, for Center distance, while the bar is still dead center between the main bolt holes
The only thing that could change is the stack of shims, under the caps. I have always used .032 thousandths, and it never has effected anything what so ever.
Herm.