They’d be great except one issue
"I usually go with dynamite diesel for quality parts in my truck but I purchased these governor springs for my p pump and they do fit on the keepers from the pump. Ive had to hone out the springs with a dermal tool just to get them to seat. Other then that 5500 rpm’s is a game Changer for power undoubtedly. I do not know if this is a common issue with 5500 rpm springs or not, these are the first ones I’ve ever tried"