I've had the same thing happen with my Holley 750.  I think the problem is either  1) fuel splashing out the secondary's vent hole and into the venturi, effectively flooding the engine with unmetered fuel    or   2) under the hard braking, the primary jets are being uncovered by the fuel moving forward in the bowl and stalling the engine.
 
A vent tube that connects the vent from the primary bowl vent to the secondary bowl vent (forming an 'arch' ) with a hole cut in the top of the tube might solve problem #1 and I've seen this on racecars before.
 
-Dave
 
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]On Behalf Of Cutter
Sent: Sunday, March 21, 2004 11:59 PM
To: The Chevelle Mailing List
Subject: [Chevelle-list] Speedometer/Demon tuning problem

The one problem I had when I converted from the T350 to the Muncie was the speedo stopped working. First I thought it was the cable or even the gauge, but after driving around yesterday with the speedo cable unhooked from the gauge, I watched it to see if it was moving. Nada. I pulled the gear out and it appeared ok. If there a simple way to track down the problem? The cable has been replaced and is in working order. I don�t want to attract any unwanted attention from local law enforcement�

 

Also, yesterday was the first day I really put some miles on her and was pretty happy with the way she was running. The only problem was she stalled on me twice when breaking hard. Is this a simple float bowl adjustment? I�ve got a Demon 750 with vacuum secondaries.

 

thanks

Ron

http://home.comcast.net/~cutter169/index.htm

 

 

 

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