Engine Vacuum Diagram

[84 W40]

These illustration came out of the 1979 NPN book. Some states do test for emissions and hope this helps for some of you.
I just stumbled on those pages, I hope there's more for the other years.

 

[Griffin84ss]

This may be a stupid question to ask but is this diagram work on a 305sbc? (84ss)

 

[84 W40]

This may be a stupid question to ask but is this diagram work on a 305sbc? (84ss)

Its not a stupid question, if the 84 ss still running the stock engine with the CCC system and you removed all of the emissions related parts including carb and distributor and replaced it with a non CCC carb, distributor and used one of the diagrams, yes it will work as long your state doesn't test for emissions.

 

[79 USA 1]

This is from Autozone's site and is for the 305ci Chevy.

 

[Griffin84ss]

Its not a stupid question, if the 84 ss still running the stock engine with the CCC system and you removed all of the emissions related parts including carb and distributor and replaced it with a non CCC carb, distributor and used one of the diagrams, yes it will work as long your state doesn't test for emissions.

Thank you 84 W40 for the info on this I am running the 305 non ccc and I pretty sure Kentucky doesn't check emissions.!!

 

[Griffin84ss]

This is from Autozone's site and is for the 305ci Chevy.
View attachment 112532

79 USA 1
Is this without emission (CCC).?

 

[84 W40]

Thank you 84 W40 for the info on this I am running the 305 non ccc and I pretty sure Kentucky doesn't check emissions.!!

If Kentucky doesn't check emissions then your all set.
Purpose I posted those diagrams is to help others out that have strict emissions laws in there state. I know it doesn't cover every GM engine but its a start. Just need to look at every page in the books I have, thats how I found those diagrams.

 

[79 USA 1]

79 USA 1
Is this without emission (CCC).?

That is with the CCC. This is the diagram I used for the small block (267) in my 79 Monte Carlo when I swapped a 4bbl into it. Same as the 350 the carb came from. Non Computer Control. With headers I deleted the EFE temp sensor and vacuum lines . Same can be done if you do not run a EGR valve.

 

[Griffin84ss]

That is with the CCC. This is the diagram I used for the small block (267) in my 79 Monte Carlo when I swapped a 4bbl into it. Same as the 350 the carb came from. Non Computer Control. With headers I deleted the EFE temp sensor and vacuum lines . Same can be done if you do not run a EGR valve.
View attachment 112566

Good info. Thank you sir I am not going to be running EGR valve.

 

[Griffin84ss]

If Kentucky doesn't check emissions then your all set.
Purpose I posted those diagrams is to help others out that have strict emissions laws in there state. I know it doesn't cover every GM engine but its a start. Just need to look at every page in the books I have, thats how I found those diagrams.

Yes sir I understand totally really good information here about it.