Even recently with in the last couple years, Bulter’s don’t recommend Scorpions on big roller cams.
Fatigue life of aluminum parts depends on the forces applied to those parts. There is a lot of lighter duty applications for aluminum rocker arms that the fatigue life is almost infinite. Different alloys effect the fatigue life, the forces on them does also. Some of my Harlan Sharp and Crane aluminum rocker arms are going on 30 years of service with roller cams. Seems like Scorpion (and some others I can think of also) have ever never figured out the correct aluminum alloy or engineering to maximize the fatigue life for their rocker designs.
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