Reply to "connecting rod nuts (again)"

FWIW, there are two different stock 351-C rod bolts. One has a pentagonal head and is a ho-hum-std bolt. The higher rated Boss bolt head is football-shaped. Both have their own nuts, but once out of the box, you cannot tell the nuts apart. Race mechanic Carroll Smith once said that the combination of a gr-8 bolt and a gr-5 nut made a gr-5 bolted joint.
As for why its a good idea to resize rod big-ends when changing bolts, it's as Doug said- you CANNOT drive old bolts out and press new ones in consistently enough to NOT affect rod alignment, even when doing one bolt at a time in a rod fastened to a crank journal. Besides, you normally want to go to minimum spec on bearing crush and match crank chamfers, and with the highly variable parts available for rebuilds these days, it's safer to get the rods resized- not just for your new bolts but also for new bearings.