[John Rogers]

As part of a full set of modifications, the roller rockers are good. By their selves, I doubt they make any difference. They are easier on big (48mm) intake valves due to the rollers and have more clearance for larger diameter/dual valve springs. They do require drilled adjuster screws and this means a lot more oil flow to the valve cover area. The increased oil flow would probably require a larger oil pump or external oil pump and a vent system to make sure the oil will get back to the sump quickly. We have had lots of troubles with pressure in the vlave covers and finally started using the CB-Performance bolt on with large vents on each cover. As for valve adjustment life I can't say as I adjust them after every race weekend. Good luck.