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Old 04-21-2018, 10:10 PM   #1
Lordzeil1
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1976 GMC truck c/k 15 Engine Vacuum

Hey all just curious if knows the vacuum layout for a 350 small block, Sadly not sure on the carb type but will most likely throw in a new two barrel in. truck has no efe system but everything else is there
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Old 04-22-2018, 09:09 AM   #2
Schurkey
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Re: 1976 GMC truck c/k 15 Engine Vacuum

At one time, there would have been a hose-routing decal under the hood. It may be missing now.

Should also be in the service manual.

If not, it's not too hard to figure out based on the needs of the devices connected to vacuum, and the available vacuum ports.
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Old 12-26-2018, 12:02 PM   #3
fast68chevy
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Re: 1976 GMC truck c/k 15 Engine Vacuum

real simple only have two choices,, ported, IE above throttle blades vacuum at higher RPM, and direct high vacuum at idle only. distrib vac advance usualyl needs to be ported and vacuum later on higher in RPM to advance the timing some alongside the mechanical weights advance too. other things like fuel vapor and EGR have solenoid or switch electrical controlling vacuum so it can provide vacuum to them only at certain temps and at certain levels of vacuum as well, and what not..
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