vacuum advance

[Pat H.]

I was clearing out a friends garage and found a few C-1 original parts in a box along with a vacuum advance stamped B-19. I do recall that the Corvette suppliers indicate a B-18 on units they sell. Another recent thread indicated a B-22. What was this used for? There is a hand written tag on it 16' vacuum.

[John L.]

Re: vacuum advance

Pat
My references don't indicate usages but they indicate that a B 18 starts advancing at 8 to 10 " hg and has 12 degrees advance at 13-16. " hg

[John L.]

Re: vacuum advance

Pat that 12 degrees is distributor - or 24 at engine

[Terry D.]

Re: vacuum advance

B-19 was used on 69 Camaro 350, according to spec sheet I have it comes in at 5.5 to 8 and has total of 12 @ 14-18