It depends on the lobe being used. They have bad performance and do collapse at lower pressures than you stated. The axle is held in with a c-clip instead of a swedge. Bad design which will fail. I would recommend my Johnson Reduced Travel Roller Lifters in any roller application. They are designed for much higher spring pressures than you are posting. The comps are bad copies of the Johnson and do not handle the pressure either. Any more info, feel free to contact me directly.