Thanks for all the advice so far. So what I'm understanding 4140 isn't a good choice? I only need to harden the races not the entire rod. 8620 may be a better option. Will 4140 case or flame harden in the bearing area? I know most aftermarket rods are made from 4340 and forged, but I can't find 4340 in flat stock and forging isn't really feasible for a single set of rods. Just want to have the best chance of having long lasting rods. |