Thread: Machine work needed for supertech 130lbs springs?

Is machine work really needed for the 130lbs springs? What needs to get done if so. Also I wanted to know how the valves would hold up with the springs. I don't want them to be too stiff or too harsh on the valves on my big boost build

Mazworxs said they had issues with cam/rocker ware with the 130springs. They suggest that you use the 100lb springs.