I know its complicated to calculate the need of valve spring pressure of a certain combination of valve train ,cam and so fourth and how different rockers affect the math.
I have been looking fore it in over 20 years and every time i found something the math is just to complicated, way over my education
“Mass is a measure of how difficult it is to get something to move in a straight line, or to change an object's straight-line motion. The more mass something has, the harder it is to start it moving, or to stop it once it starts. Similarly, the moment of inertia of an object is a measure of how difficult it is to start it spinning, or to alter an object's spinning motion. The moment of inertia depends on the mass of an object, but it also depends on how that mass is distributed relative to the axis of rotation: an object where the mass is concentrated close to the axis of rotation is easier to spin than an object of identical mass with the mass concentrated far from the axis of rotation.
The moment of inertia of an object depends on where the axis of rotation is. The moment of inertia can be found by breaking up the object into little pieces, multiplying the mass of each little piece by the square of the distance it is from the axis of rotation, and adding all these products up”
9.1.5 Valvetrain inertia force
Valvetrain inertia force is affected by component mass and valve acceleration. In the simplified single-degree-freedom valvetrain dynamics model (detailed later in Fig. 9.15), the inertia force at the valve side can be calculated as the product of the valvetrain equivalent mass and valve acceleration. The valvetrain equivalent mass usually can be calculated as follows:
9.4mVT≈mvalve+mretainer+mbridge+mspring3+mRA⋅lRA,02lRA,ValveSide2+mpushrod3fRA2
where mvalve is the valve mass, mretainer is the retainer mass, mbridge is the valve bridge mass, mspring is the valve spring mass, mpushrod is the pushrod mass, mRA is the rocker arm mass, lRA,ValveSide is the rocker arm length at the valve side, fRA is the rocker arm ratio, and lRA,0 is the radius of gyration. The effective mass of the rocker arm can be considered as the mass of the rocker arm concentrated at one point which is at a distance lRA,0 from the center of rotation, i.e., IRA = mRAlRA,02 where IRA is the moment of inertia of the rocker arm with respect to the center of rotation. Lower cam acceleration, higher stiffness, lower weight, and higher natural frequency of the valvetrain result in lower vibration amplitude of the valve acceleration. The design guideline for valvetrain inertia force control is that the design needs to achieve a precise target of valvetrain no-follow speed with an optimized gas load. Neither over-design nor under-design is acceptable for a good balance between breathing performance and valvetrain dynamics.
My conclusion is to trust what reliable engine builders com up with works and there experience what docent work in particular application/combos .