Except for some of the Stage VI heads, My P5249579 Max Wedge . The intake push rods were relocated, This is why you have to use .465 offset intake rockers.
The later Stage VI's had the tremendous guide bosses reduced a little. The Stage VI offset rockers will actually work on Stage IV heads, although Stage IV's really only need .450-.500" offset. (Stock offset is .250") Part of that extra offset is the larger Max Wedge port window.
My Stage VI Max Wedge heads flowed [email protected]" and my regular Stage VI's flowed [email protected]" (both with the 2.14" intake valve) on a bench that rarely indicates much over 300cfm with Eddy or Stealth heads, so I know they work well. Great exhaust flow as well, so raised ports do help!! Chapman Heads modified raw castings and got Indy-killing flow with Stage VI heads, using longer valves and a recontoured intake port.
