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 1971 GTO 400 MT Vacuum Lines Routing
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Tribal Scout

1 Posts

Posted - 05 Mar 2019 :  01:30:22 AM  Show Profile  Reply with Quote
The routing of under the hood vacuum lines for my 400 MT 4 barrel has been difficult to figure out after searching for hours on the internet. Each year from 1968 to 1972 all seem to route in unique ways. I have both a 5 port and 3 port Thermostatic Vacuum switch . As far as I can tell, I only use the 3 port side of the 5 port switch. (Or I guess I could use the 3 port bought on-line) The top line of the remaining ports I think may run to the distributer advance through a TVS valve? The middle line may run to the back of carburetor vacuum source and the bottom line may run to a intake manifold port? Since I did not have this motor intact when I bought the car nor do I have pictures---Can't decide if I'm right. Any help appreciated. Thanks.

Gordon Crabtree


446 Posts

Posted - 09 Mar 2019 :  10:45:04 PM  Show Profile  Reply with Quote
There is nothing different about the manual trans that I know of in 71. 455HO was on its own. This lists most years. Jay


Edited by - Corncob2061 on 09 Mar 2019 10:45:44 PM
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