I have a friend that has been having Hyd. lifter problems. Breaking them to be exact. He has been using stock replacements from the auto parts. The cam is supposed to be 530 lift Hyd. cam. I have never heard of one that big but if it is, could he be coil binding the spring causing the lifter probs? Or is it just cheap lifters and he needs to go with better lifters. Something like what esslinger offers or is there something better?