CHEVY Exhaust Valve Vacuum Route


Jan 10, 2018
I have a 80 Malibu with a 267 SBC. Where does the vacuum hose go to that originates at the vacuum activated exhaust valve? Please be specific.

79 USA 1

G-Body Guru
Sep 2, 2011
Cheektowaga, New York
Below is the diagram of the five miles of vacuum hose the 267 uses.
The EFE is the line you want to follow which runs from the valve to a temp activated switch on the thermostat housing, into a check valve then a tee if you have the air injection pump. if not then the vacuum hose runs from the check valve to a port at the rear right side of the carb.
This is basically the same diagram on the emissions decal minus the air pump on my 79 Monte Carlo with the 267.

Hope it helps.
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