Finally got this '48 lower buttoned up. Before assembly, there's a million "checks" that need to be addressed before you get it all together. Like aligning the new idler studs with the gear cover, checking cam clearances, renewing 1/4-24 threads, checking breather fit, checking flywheel endplay, do the crank pin nuts hit, any weird noises? Turn off the radio and listen as you spin it over. Do the case bolts fit properly? I use old nuts for bolting and unbolting (then I use the new cadmium nuts for final assembly - so I don't garf 'em all up). Cylinder studs installed to correct height. Make sure you read the H-D manual and install the roller bearings and cages in the correct direction for the year engine. Use the proper thrust washers, and install them in the correct location. (Lot's of engines have this stuff screwed up) I already fitted the pinion gear and oil pump gear (and lapped them for fitment) since they are usually way too tight) Fit these gears before you get it all assembled. You really got to check this shit - it takes a lot of time, but it must be done.