No. The pushrod Can Not change the rocker tip to valve stem tip contact. The rockers are Fixed and can not move around. Adjustable rockers will allow you to set lash and adjust pre-load(hyd). They also allow to to adjust the pushrod pivot vs the rocker pivot center-line, this affects over all lift/duration and scrub to a point, but it does Nothing for the actual contact of the rocker tip to valve stem tip contact point. The only way to do that is to physically move the rocker shaft up, down or toward or away from the valves. Or change the valve stem heights.
Here is an example
If your rocker tip is to far to the inside of the engine, or intake side, changing the pushrod length will not do anything. You either have to move the shaft up or use shorter valves.
Does this make sense now??? I know sometimes its hard to wrap you brain around stuff like this unless you have it right in front of you and can see it working.
