Joined
·
103 Posts
running gm hei stock type distributor with crane adjustable vac can, and accel super cap. also recently lubed everything and put a fresh rotor, and also used the mech adv springs and installed the vac can as per crane's instructions. i recently tuned the carb and timing to idle great at 950 rpm in park with 19" of vacuum, and about 700 rpm in gear. i have a 406 with a 650 dp holley, dual plane, aftermarket heads, 10.5:1CR, 241/247 ud harold cam,and some headers in front of a 2500 stall. however - two things concern me:
1. i've got my 14* of advance without the vacuum can hooked up, this gives me more vacuum than at 12*, plus it idles a little better. is this alright? or should i just keep it at 12 where some people have told me to go? it seems to have a little difficulty idling at 12* unless i raise the rpm.
2. i measured my total timing, and i am reading more than 40* of idle while using 14* initial advance. i know i should really be running at 32-34*, and i don't want to hurt anything. how do i adjust this vac can so that the total timing will reduce itself? i spent time turning the wrench both directions to adjust the vacuum can, but it doesn't change the total idle timing.
can anyone give me some advice regarding whether to stick with 14* initial, and how to change my total idle timing please?
thank you!
1. i've got my 14* of advance without the vacuum can hooked up, this gives me more vacuum than at 12*, plus it idles a little better. is this alright? or should i just keep it at 12 where some people have told me to go? it seems to have a little difficulty idling at 12* unless i raise the rpm.
2. i measured my total timing, and i am reading more than 40* of idle while using 14* initial advance. i know i should really be running at 32-34*, and i don't want to hurt anything. how do i adjust this vac can so that the total timing will reduce itself? i spent time turning the wrench both directions to adjust the vacuum can, but it doesn't change the total idle timing.
can anyone give me some advice regarding whether to stick with 14* initial, and how to change my total idle timing please?
thank you!