08-24-2007, 09:56 AM
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CC Member
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Join Date: Jul 2000
Location: Shreveport,
LA
Cobra Make, Engine: CSX4083, NOS 427 SOHC, serial number 589. Dyno'd in 1967 at 629HP with single 4v 560 Holley. Now with 4 Webers.
Posts: 295
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Not Ranked
Rick,
You have a pressure regulator set to 2-3 psi before the carbs? If the problem is intermittent, it can't be the floats filling up with fuel since that would be constant. Assuming you are not getting too much fuel pressure to the needle and seat, it was probable some thing preventing the needle valve from closing (dirt, something that got in the system during install). I had the same problem once, removed and cleaned the needle and seat and it has never recurred.
The best way to get your final tune is using ex gas analysis either with a dyno or not. They make units for home use now, about $300. Any new sidepipes should be built with a bung for the sensor to make tuning easier.
Alan J Sorkey
Shreveort, LA
CSX4083 The Cammer Cobra with Webers
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