Unless you want to run Jesel's Keyway or Dogbone Lifters, or until someone comes out with a less expensive aftermarket lifter for the Gen 3's, stock lifter travel is pretty much maxed out with .400 /.420 max lobe lift. These rockers are set up with a 1.65 rocker ratio. My solid lifter cam has a .410 lobe. .410 x 1.65 = .676. Then take away lash.... .676 - .014 (int)= .662. Mid valve lift = .331"