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Old 09-10-2014, 10:08 AM   #6
Gregski
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Join Date: Aug 2014
Location: Sacramento, CA
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Re: 1974 GMC 15 Hundred - Vacuum Hose Questions

Quote:
Originally Posted by geezer#99 View Post
I believe so [...]
Negative Ghostrider, LOL, jk

but you guys have been helpful, piecing together all the information provided it appears the EGR valve connects to the top of the two port thermal vacuum switch mounted in the thermostat housing while the bottom port of the thermal vacuum connects to a supply port in the carburetor.

Where my doohickey goes remains a mystery?

Here's a shot of what lurks beneath the air cleaner housing.
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