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That, and the fact I will be running around 650lbs open pressure springs w/ a Comp solid roller .739/.751, 276/286@50, 108 LSA, I opted for the Ersons because of the advertised rating of 1200lbs, plus at $700 set, they were $200 less than the pieces I put together over a decade ago.
IMO the key to keeping your rocker assemblies alive, esp with your cam and related spring pressures, will be keeping the shafts from flexing/breaking. Even though the Ersons have a smaller diameter shaft, they do have the end stands that wrap around the end rocker, where the shaft typically breaks.
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One thing you might consider is the strength of the helicoils in the rocker stand bolt holes in aluminum heads if you are running Edelbrocks. I know there are guys running 650 lb valve springs with the helicoils but I think there are cases of the helicoils getting pulled out with springs this strong. You might ask KC for his opinion. I took out the helicoils on the 2 sets of Edelbrocks I have with roller cam springs and replaced them with larger solid inserts (Ez-loks) for peace of mind. One is about 600 lbs open and the other is about 650 lbs open. Actually any more than this and T+D is the way to go.
The small diameter shaft in the Ersons is kind of worrisome. I have a couple sets of the Ersons and when I start installing them, the shaft flexes a lot more than with the setup I had with the thick chomoly shafts and endstands. Gives me a bit of a scare. I can't see how they can be stronger than the setup with the good shafts and endstands. I think the Erson shafts are only about 5/8 inch diameter compared to around .8 or so for the other shafts. The rockers themselves may be stronger than say the Harland Sharps, etc but there is no way a much smaller diameter shaft can be stronger especially when you have the large holes in the shaft for the rocker stand bolts. I'm not anti Erson since I do own them but the shaft itself seems to be the weak point in the system. I recall RobbMc who designed the system mentioned that shafts have broken but the stands capture it so you might not even know of the break. I don't remember hearing of too many cases of the POP chromoly shafts breaking if using endstands. I'm no engineer. JMHO
