[car4jim]

I have my engine rev limited to 6000 RPM and have had problems in the past failing inner valve springs. I was told by the engine builder the cause was due to max rev limitations on the roller hydraulic lifters. I guess the premise here is by the time the rev limiter senses and limits the engine to 6000 RPM, the engine has overshot to 6300 or more RPM and the springs fail (valve float I assume). I have a steel flywheel which probably isn't helping. I've seen threads that say to rev limit the engine to 5700 RPM to address this problem.

Will the Morel lifters improve this situation, or same problem with all brands of hydraulic roller lifters.

Are there direct replacement lifters to go solid roller, or am I looking at a can shaft change?