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Like Quick said, the back barrels don't get a pump shot. So if it bogs the spring is to light opening to fast causing it to lean out.

Holley's got about 5 or 6 different springs for tuning the vac secondaries. They are colored for different spring values so you know what your putting in, weaker or stronger. mike



Thanks Mike, I have all the springs, actually it's a Quick Fuel Quick Change Kit, I actually think it might be the short spring, which is like having no spring at all for the 1st 1/4" to 3/8" upon opening, going to try the yellow (long) spring next (second lightest) but taller...we'll see

Rickster