[V8Vairs] Backfire through the carb...

[Sethracer at aol.com]

In a message dated 6/12/2007 12:54:01 P.M. Pacific Daylight Time,  
ed_dowds at hotmail.com writes:

The pass  side port 
is called "ported vaccum" which is not normally the one you want  for a Chevy 
engine.
Ed



First, of course, check to see that the idle is set without the vacuum  
advance line connected - and 8 degrees doesn't sound like very much initial  
advance to me. But, anyway, when you hook up the ported (not manifold)  vacuum, the 
advance should not change, because the "ported" vacuum port in the  carb 
should be above the throttle plate at idle, and not subject to vacuum.  If you have 
vacuum at idle, either the throttle plates are set too far open or  you are 
testing the "manifold" vacuum port - sourced from the manifold. How  much 
mechanical advance does your distributor provide at full advance. You want  about 
35 or 36 degrees total (Max). (Initial + mechanical) -  Seth 



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