I’ve run unbushed Crane gold rockers with up to 340 pounds on the seat, close to 900 pounds over the nose, shifting at 8500 and never failed one. And that was with both W2 and W5 heads.
The bushings give little room for error if you don’t get the oil to the rockers. I prefer bushings and detest needle bearings on a reciprocating shaft, but an aluminum rocker without a bushing will work just fine.
