I run Hughes bare aluminum no bushing 40K miles SFT cam .500 lift dual spring no issues. Quality metal and heat treatment plays a roll here. If mine ever wear out I'll spend the money to have bushings installed.
I omitted Hughes, they are good too. Even DOVE work well within reason (like NOT B1 levels-LOL). Usually with quality shafts, correct length pushrods and proper oiling, the ADJUSTERS will be the weak link.
