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Old 10-27-2004, 05:35 PM
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Join Date: Dec 2001
Location: Olympia/Lacey, WA
Cobra Make, Engine: West Coast. 514 / 6 speed Richmond overdrive
Posts: 1,981
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Default Have the same problem with my Speed Demon 850

Which thankfully soon will be gone in favor of a Holley Pro-Jection Commander 950 EFI.

It's still not perfect but the solution was as follows: I set the floats to no more than 1/2 of the window (a little lower actually) and to install a polyphenolic restrictor plate under the carb. They are available as thin as 1/2"
This was the advice from the tech at Demon. Helped out a lot at idle. Also check your needles/seats (clean them) and have a good fuel filter. (My car was delivered without one and I was never told this.. )


And the final thing which I did first actually: Make sure your fuel presure is correct.. if you have a Holley Blue pump it's putting out 2 x the pressure needed. (My car also was delivered this way
) What you'll need in this case is a Holley fuel regulator. All the above was the combo which helped me.
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