I’m building a limited modified the the rocker arms contact point is slightly off the back of the tip of the valve almost like the pushrod is about .250 or so to short. it really pushes on the valve when it starts to open it. The rules say stock rockers and stock length pushrod. The block and head have both been cut And a .045 head gasket. the only way I know to make it better is to grind the contact point on the rocker. I was going to see if anyone else has a better solution.