Edelbrock 1406 guys - The 1947 - Present Chevrolet & GMC Truck Message Board Network

drman929 · 08-15-2007, 10:46 PM

I was under the hood of my 72 earlier and I noticed that my vacuum secondaries don't open when I open the throttle. Not even if I hold it open. They are slightly stiff but I can open them by hand. Does the engine have to be under a load to open the secondaries? I don't think they are opening at all though, or at least it doesn't seem like it.

So, when you are under the hood racing the throttle, does your secondary shaft move?

08-15-2007, 10:46 PM	#1
drman929 Registered User Join Date: Nov 2006 Location: Arkansas Posts: 232	Edelbrock 1406 guys I was under the hood of my 72 earlier and I noticed that my vacuum secondaries don't open when I open the throttle. Not even if I hold it open. They are slightly stiff but I can open them by hand. Does the engine have to be under a load to open the secondaries? I don't think they are opening at all though, or at least it doesn't seem like it. So, when you are under the hood racing the throttle, does your secondary shaft move?



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