[Cracker]

I'm running Erson as well in my 427 S/O but only because I couldn't find anyone (including Shelby) who had theirs in stock.
So I went with the Erson assembly and the only thing I found different was I needed to switch from head studs to bolts to clear the end stands. It is a one-piece design unlike the bolt through CompCams/Shelby/Dove units. I use them on a Crower .600" lift and they are terrific - just lock those adjusting nuts down (I was lucky). Cheers!

I just called and spoke to Gary mentioned in the thread above and wish I had had his info before. He said they believe Shelby is going to start manufacturing their own units and didn't want to give them an exclusive to their product at the price point they were selling. Cheers!

Tony