One thing to check when running in the 0.060-0.080" range (to coil bind) is to check each and every valve spring for actual coil bind height, and ofcourse setting each installed height accurately. And there is a concern about the actual rocker ratio (1.5 or 1.55 etc.) compared to the published ratio.

My current setup is 0.090"

When I purchased these heads the builder told me the springs were good to .650 lift so what you guys are saying is that there isnt even enough room for a .630 lift cam??

Just curious, is anyone running the schubecks on the street? Do they hold up well there too? Thanks

And at that installed height that Jim is talking about you will not have nearly as much seat pressure. This is where things get tricky as not enough valve spring pressure you start bouncing the valves or float them and to much valve spring pressure you can wipe the lobes off the cam. I'm running a comp 932 spring on my indy heads. With an installed height of 2.000 and a coil bind height of 1.160 with my cam .675 lift I have .165 clearance before coil bind. And I also have 200lbs of seat pressure with those springs. That much seat pressure is ONLY for a set of composite lifters. I guarrantee you would wipe a cam with standard lifters with that much pressure. I don't want you to go through the crap I have with all this so spend a little now and save a pile of money later.