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Old 03-03-2013, 04:07 PM
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dual quad flooding

I have a 400 cu in 1972 Chevy small block. I put in an edelbrock performer cam and two wcfb carter four barrels on it. It floods at low rpm. I blocked off the front carb for the time being. I'm thinking of disabling the low speed system on the front carb and/ or jetting it down.Will it work? Any other ideas? Thanks, Vette1960

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Old 03-03-2013, 04:17 PM
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Flooding is not caused by jetting. You either have something stuck in float, causing it to stay open all the time, or the float could be set too high, allowing fuel to run out of the bowl into the throttle bores.

A third posibility is that you have a high pressure fuel pump that is pushing the needle off of its seat, completely bypassing the float assemblies operation.
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Old 03-03-2013, 04:36 PM
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limit the fuel pressure to 5psi, clean out the carbs and get a fuel filter.
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Old 03-03-2013, 04:48 PM
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where did you get wcfb s? lol. get a super stock racer nearest you to help you.
why wcfbs?
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Old 03-04-2013, 05:02 PM
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why wcfb's ?

The 400 small block is in my 1960 Corvette. I know it doesn't belong in there but it came with the car and an original 283 is pricey. 1960 vettes could be ordered with dual wcfb's so it looks like a stock 1960 Vette setup. Thanks for the replies. vette1960
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Old 03-04-2013, 06:28 PM
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Quote:
Originally Posted by vette1960 View Post
The 400 small block is in my 1960 Corvette. I know it doesn't belong in there but it came with the car and an original 283 is pricey. 1960 vettes could be ordered with dual wcfb's so it looks like a stock 1960 Vette setup. Thanks for the replies. vette1960
When you say "flooding", do you mean there's excess raw fuel coming from the boosters or is it too rich, like can be caused by the idle/transfer circuit's calibration?

Besides the other suggestions, the WCFB uses brass floats. They can take on fuel and become heavier, this will cause the fuel level to be too high even though the floats are adjusted right.

How big is the cam? Do you know how much vacuum it has at idle? And do the idle mixture screws cause the idle to change, or will the engine stay running w/the idle mixture screws turned all the way in? If it will stay running, you need to add some initial timing to it. This might mean removing some timing from the mechanical timing to keep the total timing from being too high.
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