I got a set done by RAS, maybe about 10 years ago. The rockers are bushed down and run on smaller shafts. They did this to maintain the strength of the rockers. They tend to break with higher spring pressures when bored out for a bushing or the body under the tip is relieved for clearance. I think they are 273 rockers. I don't know how accurate of a job they did with the ratio. But I switched to Harland Sharp roller rockers because they became legal.