Adjustable rocker ratio

Never got past Algebra. LOL Mine weren't 1.5 either and the difference in angles can be tricky when you mill heads and grind valves and install new ones. I used the phrase "tolerance stacking" when I went through my 273. So many things were changed some adjustments had to be made with pushrod length and shimming the rocker shafts to get the angles closer to correct. tmm