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Home » Public Forums » GMCnet » 1978 Emissions control 'plumbing' (Where are the Vacuum Control Valve & Solenoid Valves?)
1978 Emissions control 'plumbing' [message #171677] Fri, 01 June 2012 20:51 Go to next message
sdean is currently offline  sdean   United States
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Registered: March 2005
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Junior Member
The Vacuum Control Valve & Solenoid Valves are two valves that are connected via vacuum hose in the emissions control system as shown in the MM in Section "T" on pages 4-7. It's been too long for me to remember where these 2 items are mounted, or even what they look like since I began the conversion of my 1978 403 to a 455 several year ago. I'm almost ready for the CA. smog test and need to install these 2 valves. I do have both maintence manuals, but can not locate my Parts Manual. The Maintence Manual only has emission diagram schematics on the above pages but NO PHOTOS.

Is there a link to photos showing what these 2 valves look like and where they are mounted?
Thanks..........Stephen
Re: 1978 Emissions control 'plumbing' [message #171727 is a reply to message #171677] Sat, 02 June 2012 07:12 Go to previous message
C Boyd is currently offline  C Boyd   United States
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Registered: April 2006
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Senior Member
Sir: here is the parts book
http://www.bdub.net/manuals/parts/GMCMH-Parts.pdf






sdean wrote on Fri, 01 June 2012 21:51

The Vacuum Control Valve & Solenoid Valves are two valves that are connected via vacuum hose in the emissions control system as shown in the MM in Section "T" on pages 4-7. It's been too long for me to remember where these 2 items are mounted, or even what they look like since I began the conversion of my 1978 403 to a 455 several year ago. I'm almost ready for the CA. smog test and need to install these 2 valves. I do have both maintence manuals, but can not locate my Parts Manual. The Maintence Manual only has emission diagram schematics on the above pages but NO PHOTOS.

Is there a link to photos showing what these 2 valves look like and where they are mounted?
Thanks..........Stephen



C. Boyd
76 Crestmont
East Tennessee
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