I'm about to put the rod bearings in my '72 F, and reading the manual I see that they say about the rod bearing cap nuts: ". . . later models use self locking nuts that should be renewed on reassembly.". I haven't found any discussion in the forums I've checked. A cruiser buddy says he's built more than a few engines and always used the bolts over. SOR only wants .60 apiece. . . . but I'd have to wait until next week to see if the dealer has them. What's the general consensus? Manufacturer overkill or necessary precaution? I have a set of early rods that have the castle nuts and cotter keys - but I 'spose I'd need to rebush them and not sure about using them with my current pistons & wrist pins. They sure appeal to my industrial strength side - got to add 150ft/lb of torque!