[Tom Vaught]

A request has been made to start with the 1966 Tri-Power information, so here it is,
beginning with the Carburetor Part Numbers. Similar info has been posted in bits and pieces in the past so this is a attempt to consolidate some of the information.

1966 389 engines:

Front Carb: 7024178
Front Carb: 7025178

Center A/T Carb: 7026074
Center M/T Carb: 7026075
Center M/T Carb: 7036175* * is A.I.R. Carb - AIR INJECTION REACTOR Carb (Calif.)

Rear Carb: 7024179
Rear Carb: 7025179

1966 421 engines:

Front Carb: 7024078
Front Carb: 7025078

Center A/T Carb: 7026074
Center M/T Carb: 7026075

Rear Carb: 7024079
Rear Carb: 7025079

1) The part numbers for the Rear End Carbs vs the Front End Carbs is 1 number higher.

2) For 1966, the 1966 Tri-Power Carbs basically used the same castings as the 1964 and 1965 castings
as Rochester Products knew that the Pontiac Tri-Power Carb Systems were being discontinued.

3) The Delco/Rochester Products Engineers sent me a 1967 Bulletin 9C-621 (Date May 1967) that replaced 1963 Bulletin 9C-631 (date Oct 1963).

A "handwritten note" note says: "Original Pages from old AC/Delco Carburetor Catalog.
Most Parts are no longer available".
The sheets are labeled:
Delco Rochester Model 2GC Carburetors
There are 3 groups of pages: (1964, 1965, 1966).
Example:

"1966 Pontiac, "V-8"
Triple Two-Barrel Carburetor Installation
389 Cubic Inch Engine

The one I have for the 1966 engine is Bulletin 9C-627
Date May 1967, Replaces 9C-640, April 1966
(For Specifications, see Bulletin 9 PO-1.)
(For Adjustments, see Bulletin 9 PO-3.)

The Delco Information specifically does give you carb rebuild information:

Example (for 1966 carbs)

Front Auto:
Carb Number: 7024178
Replacement PKG No: 22-655A
Overhaul Kit: 7031480
OK Kit: VTR-617
Gasket Set: 40-338
Altitude Kit: 7033029

The information also gives you a Part Number for Every part listed in the kits:
Air Horn Parts, Choke Parts, Float Bowl Parts, Throttle Body Parts, Vacuum Control Parts, and Linkage Parts.

Example: The Link for the long rod that connects the front carb to the rear carb is part Number 7015362. The Rear Clip is number 7011249, and the Front Clip is 554285.
The Water Controlled Vacuum Valve is called a "Thermo Vacuum Lockout Valve" and is part number 7026096.

As Dick B posted, there are literally hundreds of parts and part numbers for the different Tri-Power Systems for just the 1964 to 1966 systems.

Tom Vaught