Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Rochester Quadrajet 4MV Carburetor: Removal, Disassembly, Rebuild (Rookie Level)
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Old 03-26-2011, 07:26 PM
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Originally Posted by cobalt327
GM came up w/a LOT of Rube Goldberg-ish devices to deal w/emissions, and this is yet another one that needs to be relegated to the trash bin- as long as your jurisdiction's emission testing doesn't require you to keep it.

I would consider it TOTALLY superfluous and I wouldn't hesitate for an instant to remove it and it's related encumbrances- or at the very least to render it inoperable (like what seems to have been done previously) and retain it for visual inspection compliance only.
I have a strong feeling it is because of emissions that it was kept (it is California, after all). But then the only issue is, this truck is missing an EGR valve and the intake doesn't have the provisions to install one. Boy I would love to talk to the guy who worked on this.

By the way, just for added info, the device on the manifold that provides vacuum to the actuator is also connected to the carb via hose up front. below are pictures with the cap off, as well as the inlet/out let where the other hose slips on. (Sorry, should've done this a while back).

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