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69 Z28 vacuum line question.

823 views 3 replies 3 participants last post by  ctcz28 
#1 ·
Does the vacuum advance line go to a ported or manifold vacuum on the 69 cars w/Holley carb? A picture would be nice as well thanks.
 
#4 ·
Ported, but READ THIS for a better way.

Ed

Yes, read Timing 101 and you'll see that you want to use full manifold vacuum and not ported. Switch to full manifold vacuum and you'll see an improvement in performance. When you do this however, make sure to adjust your vacuum advance. You may need to install a positive stop on your distributor vacuum advance.
 
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