Stumble off idle -

[decooney]

Hi John,

For what its worth you might want to chat with Phil at QFT. He will get into aspects of metering, adjustability, tunability, and comparisons far beyond my basic knowledge of the various carb systems and circuits. After going through this analysis, trial and error, more than I care to admit for my own Cobras and builds for friends, I have strayed away from the the Avenger and HR street "efficient" carbs based on my own findings and tests. I learned way back to not listen to the conservative "its too big" or "its too much" crowd when there is no actual test data to back it up in many cases. I relied on first hand tests with my engine builders and beyond that in my own cars. I continued with the basic Holley HP or Quickfuel Q series performance carbs for my Cobras and buddies cars and builds. In the end, its paid off in terms of performance and improved mileage, clean running, and clean shutoff too, believe it or not. Result: at-will tire spin, and 16.2 mpg with an old 428CJ and 4-speed transmission using my Holley HP 830. My buddy got 15.2 mpg on his 482cu. in. running a HP 950 Holley. Not too bad for big sloppy FE motors with larger cams, etc. Prior to this I ran a 780 vacuum secondary carb on my Cobra, and it did not have the same performance or mileage. I'm rambling... I recommend speaking with Phil or anyone in the custom build shop at QFT. DISCLAIMER: What works on my car may not work on others cars, but since our engines and cars are so close, I thought it might be comparable for consideration. Keep up the good work, it will pay off.