[68hotbird]

These are sealed power lifters don't remember the number off the top of my head but I will get it. These lifters and the others I am trying to make work have run for many miles with 150# of seat pressure and 400# over the nose. If the second lifter I am working with will work there are thousands of them running in high rpm engines with loads of spring pressures. I am still evaluating the effects of total mass on the lifter load. I know our Pontiac valves and rockers are heavier than some of the comparison parts but there are also engines running these parts with even heavier valves, springs, etc.