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Old 12-20-2014, 03:57 AM   #21
Oregoon
Roadside Rebuilder
 
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Join Date: Oct 2008
Location: Southeast Portland, OR
Posts: 421
Re: rochester 2jet - any carb experts?

Quote:
Originally Posted by ChevDog1 View Post
The carb only has manifold vacuum available. There are no vacuum ports above the throttle blades as far as I can tell. Why?
I had a bit of a flat-spot in my set up (I have a '74 250 with mighty monojet and '76 HEI), and pulling vacuum directly off the manifold eliminated it.

Check out the link and scroll down to post #3 for a very thorough explanation: http://www.chevelles.com/forums/showthread.php?t=94121
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