Vacume Hose Diagram for 1968

Q: Vacume Hose Diagram for 1968

I am in need of the vac hose diagram for my 1968 350 ho with the dual vac advance. No a/c or air pump. The advance has been replaced with a single port which is WRONG so I want to put it back right along with the plumbing. Thanks in advance.

A: I don’t have a complete answer but maybe this will help.

There should be a themostatic control switch which mounts on the passenger side of the intake. It will have 5 ports on it. One (DA) goes to distributor advance. One (DR) goes to distributor retard. One (CA) goes to carb advance – I don’t know which this is but I think (??) it is ported vacuum. One (CR) goes to carb retard – I don’t know where this is. The last one goes to to manifold vacuum (at the bottom rear of the carb). If you have an Automatic, the vacuum modulator also goes to manifold vacuum.

Also, the AMES catalog sells both the control switch ($35) AND correct color vacuum hose kits ($54 – ouch). They also have a pretty good diagram of a 1968 4bbl in their catalog and I’m guessing they send directions with the kit.

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