<VV> No Balance Tube needed for Corsa Dash install

[Sethracer at aol.com]

In a message dated 10/2/2011 7:19:55 A.M. Pacific Daylight Time,  
dixon5553 at yahoo.com writes:

In order  to operated the vacuum gage on a Corsa dash, do I need the vacuum 
tube off a  140HP engine that has the pproper fitting or will a 110/95 HP 
automatic  balance tube have this fitting too?

Thanks

Rich  

Rich, Honestly, the vacuum gauge (Pressure only on Turbos) is pretty  
useless on the Corvair. The stock feed location on the 140 is in the middle of  
that crossover tube.It was only used on 140HP Corsas. It probably presents  
an average of the manifold vacuum in the two heads. But for all that is 
worth,  you could feed the gauge from the base of one of the carbs. For ease of  
assembly, Chevy used a tube fitting with the male threads on the crossover  
tube. If you are not too concerned about originality, you could insert a 
"tee"  in the hose from the carb-base hose fitting, which is directly tied to 
manifold  vacuum on that one side, and feed your gauge from that tee. The 
manifold vacuum  tube is the one that comes out sideways from the carb base. It 
is used to  feed the choke pull-off diaphragm on the top of each carb. The 
ones that  come off vertically feed ported vacuum - the right side feeds the 
Carb  vacuum advance unit.  Feeding the gauge off the left side manifold 
feed  would be cheap, effective and totally reversible if you change your 
mind. Don't  use the vertical tube, the one with the cap on it. It won't work 
correctly for  you.   
 
-Seth Emerson