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Username Post: Vacuum diagram for 75 Chevy 350 4Bbl        (Topic#12948)
Posts: 2

Loc: Fresno, CA USA
Reg: 12-03-02
12-03-02 12:31 PM - Post#85332    

I am a public reference librarian with the San Joaquin Valley Information Service in Fresno, CA. I have a patron who is looking for the vacuum diagram for his 1975 Chevy 350 truck. It's a 4 Bbl. I don't know if it's California or Federal. The only diagram I found for a 1975 was from "Mitchell's 1969-78 Vacuum Circuits Domestic Cars, Light Trucks & Vans". It was a very rough picture of the engine and did not match the patron's engine. I found some GM Truck Emission Control diagrams for the 1976 year in the same book which might work, but I'm not sure. They have several for a 350 4 Bbl. I noticed that some of you may have access to the ChiltonOnline service, but I am not a subscriber. Our library subscribes to Alldata, but that only goes back to the mid 1980s. Does anyone in this forum have the exact diagram I'm looking for or know of a source? Would the '76 diagrams work? Any clues would be much appreciated. It would make my patron very happy. Thanks for your help.

Kathleen Smith, Librarian
San Joaquin Valley Information Service
Fresno, CA

Senior Member
Posts: 416
Loc: Mobile, Alabama
Reg: 10-12-02
Re: Vacuum diagram for 75 Chevy 350 4Bbl
12-03-02 02:52 PM - Post#85333    
    In response to kksmith1

Kathleen....I think the '76 diagrams will be the same as the '75 models. I have the '75 service manual and it is just a supplement to the '74 manual. The emissions changed in '75, so the '74 book would be wrong. My '75 book does not show any vacuum diagrams. There are service manuals for sale at I hope this helps you.


1987 4x4 Shortbox Stepside

1987 4x4 Shortbed Stepside

Posts: 2

Loc: Fresno, CA USA
Reg: 12-03-02
Re: Vacuum diagram for 75 Chevy 350 4Bbl
12-04-02 01:28 PM - Post#85334    
    In response to 87BlkStepside

Bill, thanks for the quick response and a confirmation that what I have for '76 might work for my patron. I'm delivering them to him today so we'll hope for the best. I also gave him the URL for in case he wants to jump in himself and join this good knowledge base. Thanks again.


"2nd Year" Silver Supporting Member
Posts: 10767
Loc: The cold wet and windy O...
Reg: 03-10-01
Re: Vacuum diagram for 75 Chevy 350 4Bbl
12-04-02 05:52 PM - Post#85335    
    In response to kksmith1

Kathleen.... it's not a good knowlege base...
It's GRRRREEAT. (that's my Tony the tiger impression)
The spelling here may not always be good, but the advise is very good. There are a lot of very knowledgeable folks here. Info your patron could appreciate.
The other place on Chevy Talk to ask this type of question might be on the Performance section.

( be sure to remind your patron to ask questions quietly, so as not to bother the others who are studying here...... and.... no smoking.


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