Dick, I think Terry is asking about the Center Carb Tee.
Here it is from a mag article.
Note, the '64/'65 GTO never used the connection on the RH side of this Tee.
The GTO always had a Threaded Sleeve Plug in the RH outlet. I have found Threaded Sleeve type fitting suppliers offering the same TS Nuts & Nut Sleeves that were used, in most cases still listed under the same p/ns used in the '60s.
But I have never found original type TS Plugs, maybe just haven't looked hard enough.
The RH outlet was only used for the big Cars (with or without A/C), it supplied Vac for the Vac operated Heater Control. The Tempest Heater did not use Vac operation.
The LH outlet normally supplied Vac thru a fitting to the Dist Vac Advance unit, by way of a Vac Hose.
Some big Cars used ported Vac Advance from the RH side of the Center Carb Bowl. In those cases, the LH outlet of the Tee was plugged.
All GTOs used the manifold Vac Advance off the LH outlet of the Center Carb Tee.
As to the Front Carb fittings, Dick, if I understand what you are saying about the Auto Trans applications, I don't agree.
First, Terry, you would always need the Plug for any GTO for the RH outlet of the Center Carb Tee as noted above. Vac for the Super Turbine Auto Trans was not picked up from the Center Carb Tee and the A body did not require a Vac connection for the Heater or the A/C.
The big Car did not require a Vac source for the Auto Trans in '64.
But the big Cars did require a Vac Source for '65 when they went to the TH400.
The attached MPC Illustration shows how this was done. Although it is not labeled, the arrangement illustrated in the upper right is the Tri-Power arrangement.
The Plug Item 16 was deleted when the car was equipped with Auto Trans and Power Brakes and the Vac Pipe for the Power Brakes connected where the Plug is shown.
I believe the Power Brake Vac Pipe was just a little bit different for the Auto Trans cars vs. Man Trans.
Unfortunately, there is no similar Illustration specific to the GTO with Auto Trans.
It is my view that the '65 GTO with Auto Trans was set up the same as the '65 big Car with Auto Trans.
This set-up was similar to how the '64 GTO with Auto Trans was set up, except evidence suggests that the '64 Vac Extension Pipe (Item 13) had a longer extension so that it was solid (no rubber hose) between the Extension and the Front Carb rear fitting.
It is possible that the '64 solid Vac Extension Pipe was revised as a running change to the '65 more flexible arrangement sometime during the '64 Model Year.
None of that matters to you for a man trans car unless you have Power Brakes.
My speculation is that for a '64/'65 man trans GTO with PB, the Vac Extension Pipe was not used. Rather, a specific PB Vac Pipe was connected directly to the Front Carb rear fitting.
Unfortunately, I have never found enough evidence to prove the Vac connections for the PB with or without Auto Trans.
I assume without PB, the '65 man trans GTO used a Plug in the LH outlet of the Front Carb rear fitting, while the RH side has the rubber cap on the RH outlet nipple as Dick described.
Dick, my question is, why do you say, "There was no vacuum line to the '65/'66 automatic trans."?
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