<VV> Carb base leak

[BobHelt at aol.com]

In a message dated 6/1/2009 2:56:05 P.M. US Mountain Standard Time,  
contactsmu at sbcglobal.net writes:

Don't  forget all 64 and up carbs have a built in vacuum leak at the  
base  of the carb on purpose.

I received this reply to my carb base leak  problem.  I admit that I  
don't know a lot ...yet, but I've  never heard this before.  If it's  
true, then perhaps the  100-200 rpm increase that I see when I spray  
carb cleaner at the  base of the carbs is "normal".



Well, I wouldn't call it a vacuum leak exactly, but yes, at idle, the vapor 
 vent is open and it is possible that anything you spray at the carb base 
can be  drawn into the venturi above the throttle plate and find its way into 
the  engine.
Regards,
Bob Helt
**************An Excellent Credit Score is 750. See Yours in Just 2 Easy 
Steps! 
(http://pr.atwola.com/promoclk/100126575x1222377040x1201454360/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072&hmpgID=62&bcd=Jun
eExcfooterNO62)