Duraspark II with ram air debacle

[Stanglover]

Very interesting, folks.
I sorta guessed at mine as to be honest, I really didn't understand how the adjustable can worked. I know my mechanical all in is 34 degrees with an initial of 14 degrees i.e. 10L slot (made that too) and the all in with vacuum is about 38 deg.
As I want to revisit my carb PV and accel pump settings when the weather warms up, I'll also look at the timing and vacuum advance again, I'll be revisiting this post for info.
Thanks to all.

 

[351mach1]

So I might propose this question next then: for a 351 with a duraspark 2, what can would be the better option and why? What are the pros and cons of each type of can?

 

[basstrix]

What is the vacuum level needed to fully actuate the VC31? Was the amount needed the same, or close to, for the different ranges you measured? Knowing that will help me to decide which can would work best for me. I don't really like the type I have...presumably the 210?

 

[Don C]

The attachment in this post may give you an idea. It's a Crane adjustable vacuum can, but I believe it is close to the same as a VC31
https://7173mustangs.com/threads/vacuum-advance-adjustments.37381/