Rocker arm ratio

[George Osmundsen <gosmund@mail.jax.bellsouth.net>]

Listers,
I'm trying to do some calculations having to do with the valve train
on my '76 TR6.  Does anyone know what the rocker arm ratio is for this
car, and is it the same for all the TR6's?  I've tried to calculate
the ratio using measurements taken from the car and the best I can come
up with is about 1:1.51.  Have looked in all my references and can 
find no factory data on this spec.
TIA

Skip Osmundsen
'76 TR6
'60 TR3