Dual quads versus big hammer!!!...

yellow rose said
So...I think you should go out and get some vacuum reading at a cruise. Then, set your springs to open a few numbers below what cruise vacuum is. For example, if you cruise vacuum is 15 inches, set your springs to open at say...11 inches and see what happens.

If your idle vacuum is say...only 9 inches, you can test to see if the metering rods being up at idle makes a difference (I don't think it will because the idle feed system is very similar to a Holley and the Holley guys have been getting it wrong for decades) or if it doesn't matter. I don't think it will matter.

You can tell by verifying your A/F ratio at idle with say...a spring that pulls the metering rods up a 6 inches of vacuum and compare that to the A/F ratio at idle with the 11 inch springs in it.

If I'm correct, the A/F ratio will be the same at idle with either spring in it it, and the higher spring number (pulling the metering rods out of the jets sooner) will help clean up the lean spot on cruise tip in.

have all day tomorrow so what it really boils down to is three more trips around the neighborhood. Springs in now and tomorrow plan on trying the green witch came with the carburetors. Then on to the pinks. And then one more try with the silver... Remember I went back down to those directional .031 Holley squirters.. I have the street demon 42's and 47's as well.
On top of that again I'm extremely interested to see what happens with those metering rods. Remember I have 62-54's in there now.. with 58-44's in the front and 58-50's in the back I'm interested to see if that doesn't do it when those rods do go up allowing much more fuel...

This is how the Edelbrock dual quad 500 or setup..