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8valve, I know this is way after the fact, but I just found your post and am having a similar issue.
Yours appears to have been a 66' Toronado with 67' cannisters (1 vacumn line.) and according to that manual it needed 1 check valve GM PN# 394420.
In my case, I have the original 2 port cannisters and am trying to find a good vacumn schematic. 67' also has a 4 port vacumn valve, where 66' does not. Someone told me that everyone with one of these systems replaces them with 12vdc/ vacumn valves. Heck if I can find one. I would like to know what you found out.
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