Quote: - try reading the book "Valve Gear design" by Michael Turkish, 1946, Eaton corporation. Turkish was a mathematician who worked for Eaton - and Eaton was a tier one supplier to GM - and probably a lot of other automotive OEM's. Yes, the math is well over my head, but pretty much as you alluded to verses the common 50/50 rocker arm arrangement ( 90* at mid lift) that most use today.
Dated 1946, well before the roller rocker.
Mike Beachel
I didn't write the rules of math nor create the laws of physics, I am just bound by them.
- try reading the book "Valve Gear design" by Michael Turkish, 1946, Eaton corporation. Turkish was a mathematician who worked for Eaton - and Eaton was a tier one supplier to GM - and probably a lot of other automotive OEM's. Yes, the math is well over my head, but pretty much as you alluded to verses the common 50/50 rocker arm arrangement ( 90* at mid lift) that most use today. 
