Vacuum line diagram?

[heavychevy79]

Originally Posted by dswancutt

There should be an emissions label on the core support with the vacuum diagram. GM started that in 81 I believe. Also look for a code if you can find it. I know on my 77, it is CM which is the light duty 350 emissions class.

Some are on the air cleaner. But it's prob been discarded for one of those chrome ones that everyone's just gotta have on their engine.