You can measure the rocker geometry and figure the ratio as follows:
Measure the distance from the center line of the valve stem to the
center of the pivot point of the rocker.
Measure the distance from the center line of the push rod to the center
of the pivot point of the rocker.
The ratio is the (Valve to pivot distance) / (Push rod to pivot
distance)
Example:
Valve to pivot distance = 1.5 inches
Push rod to pivot distance = 1.0 inches
Ratio = 1.5 / 1.0 = 1.5
Basically, it's a simple lever and for the small lift of the rocker and
valve the above formula is a very close approximation.
Tim Murphy
1961 TR-4 CT511L
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