Quick Tuning Upgrade Holley Vacuum Secondary

318willrun said

You'll tune/adjust it with the screw. You'll have no need to take it apart and even look at the spring

Mine came with the plastic top "quick change" also. The Quick Fuel is faster and more precise. You can turn it in the slightest increments if you want to....

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Good to know, the one I have is a 670 model, have never bolted it on anything.
If I ever find time I may put it on my duster, because it has an electric choke.
The double pumper I have on it now, I dont have a choke cable hooked to it, so starting sucks, because it is just a pleasure vehicle, not started much.