i have searched i can`t find if there is a break down on the #`s & there meaning for the vac cans on the vac can arm. i have 6.5`s to 11.5`s, which has the most and the least timing?

The stamp on the arm doubled will be your crank degrees when using a timing light... so the 6.5 arm will net you 13( the least), and the 11 arm will be 22(the most).... as an added side note, when they 'come on' and 'leave'/stop giving advance at what vacc. reading is different per can and you can adjust this a bit with an allen key, but some models don't have much 'play' to them (like the feather duster can is pretty much all 'in' all the time, and adjusting it only lowers the point at which it stops giving vacc. adv.)


Good luck on your curving,

-D.Idiot