Anyone use these for over 500 lift cam

But for the guys like me who have, say, econo W2 heads, I'm limited to a .550" lift camshaft due to the short valves etc. if these things work, I don't have to replace what I have or do extensive machine work to get rid of the cast in pedestals and just shim up what I need.

I'm going to look into this!

W2 econo heads are not limited to .550 due to valve length....if you are limited to .550 it would be the spring height or coil bind on the springs...not the valve length