My new cam lift specs are .608/.578. I'm also running Comp R lifters, "Beehive" springs and the GMPP 1.6 roller rockers. I was curious about the .575 lift limit on the rockers, so I assembled one of the cylinders, spun it over a few times and *nothing* came close to hitting or binding in the valvetrain. The only problem I have is that the valve covers don't seem to want to seat all the way not. Not real sure if there is a clearance issue with the rockers or if it's something else at this point but I'm working on it.

 

Your rocker arms are more than likely hitting your stock valve covers.

 

Just got it sorted out- no clearance problems with the GMPP 1.6 rockers, the problem was headstuds hitting the bracing under the valve covers. I clearanced that now everything fits just fine.

 

Good to hear. I am glad you got it all taken care of.

The worst problems are the one's you dont know why they are happening.