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This page shows the most common vacuum line diagrams for stock TPI setups:
The diagram above is for 1985-1986 5.0L F-body (Camaro/Firebird) MAF TPI
1985 2.8L V6 MFI Camaro-Firebird Vacuum Line Diagram
1985 Corvette 5.7L TPI Vacuum Diagram
1986-89 2.8L V6 MFI Camaro-Firebird Vacuum Line Diagram
1986-1989 5.0 and 5.&L TPI Vacuum Line Diagram
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1988-92 5.0L TBI Camaro-Firebird Vacuum Line Diagram. Manual trans
1988-92 5.0L TBI Camaro-Firebird Vacuum Line Diagram. Auto. trans
1990-91 Corvette 5.7L Vacuum Line Diagram
This diagram is for 1990-92 F-body (Camaro/Firebird) Speed density TPI
1990-92 3.1L V6 MFI Camaro-Firebird Vacuum Diagrams
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Above picture shows some of the various vacuum lines and fittings you'll need to complete your set up. This is not all of them, but gives a good idea what may have to be done, especially if you decide to use anything but the stock valve covers.
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