Rocker arm recommendations?

Bewy said

IQ,
You claim that the roller centre determines the rocker length on the valve side.
Well how do you explain this: using longer than optimum pushrods in most cases, if not all, increases valve lift.
What changes in the movement of the rocker arm such that more valve lift is obtained?

Click to expand...

I personally have no experience with "longer than optimum pushrods" Is that like giving 110% or rather 10% more than you actually have?

Anyway......

With a rocker shaft system........

Just by holding an adjustable rocker arm in your hands and moving the adjuster in and out, you can answer your own question.

For an example.....

I have here at this moment a Brand-X aluminum roller rocker arm.

To display the pushrod effect on this rocker I extended the adjusting screw out 9 turns (to simulate a short pushrod) and measured the distance from the center of the adjuster ball to the rocker shaft by simply using a dial caliper. Then I moved the adjuster screw in until there were no threads showing (to simulate a longer pushrod) and then again measured from the center of the adjuster ball to the rocker shaft.

In this example the ball moved approximately .020"-.025" closer to the rocker shaft when there were no threads showing (like the longer pushrod). Moving the adjuster ball closer to the fulcrum increases the rocker ratio and thereby increases the lift.