[LM93]

Keep in mind, the way aluminum fatigues means that all aluminum rockers have a finite number of stress cycles before failure, no matter how well they're made. Fine for a race car that can change them out each season, maybe not for a car that gets driven often.

[Jay S]

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.

[fastekibeast]

I have those Endurance rockers in my recently build 400 engine with solid roller cam in it,
about 600 street driven miles with them, so far so good.

[PDC]

I’m at the point where the cost difference between Crower SS Enduro Rockers and any other rocker out there compared to the cost of the overall engine build is a decision that makes itself.

[Formulajones]

Originally Posted by PDC

I’m at the point where the cost difference between Crower SS Enduro Rockers and any other rocker out there compared to the cost of the overall engine build is a decision that makes itself.

That's really what it boils down to for me. As much as these engines cost these days to build them right and use top notch parts, it's not a hard decision to just put a good rocker arm on it. Budget might mean you just have to wait a little longer to get them but the biggest issue I've had is whether they are even on the shelf.