Re: Block Question?
I highly doubt that blocks made from actual steel and having the same dimensions sound very different, and I don't see how they would age.
I actually have a GFS steel block for my normally zinc block MIJ trem here but didn't come around to test it. But you'd still have slightly different saddles.
Quite honestly I can't see the AVRI trem that you can buy on Amazon being much different from the Callaham. I have a Callaham and it was a audible difference to the zinc block equipped MIJ, I can say that much.