Yes, the theory is that the intake valves, which were the only ones affected, I was told weigh about 125 grams. If you go to the PSI website and look up the 1512 springs, they are fairly light. The rocker contact pads were wearing off, but the biggest issue was that the valve stems themselves were being worn down, and the worst one of the 4 measured out at .080 worn off after 50 runs.