The 1966 Pontiac Tri-Power Carburetors information, as requested.
(For verification of the Carburetor Calibrations that you have on your 1966 Engines.
"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."
I will start with the Front Carb: 7024178 I will follow the same format at the Rochester Products People in the way the
information is presented.
Air Horn Number: 7013884 (1)
Venting: Internal 3/16" dia in scoop
External Venting: None
Support: None
Needle Seat: 7027846 Size: .086:
Float Valve: 7022782 Pull Clip: None
Float Assembly: 7012028 Spring: None
Fuel Level: .750" at 6.0 psi
Mech. Setting: .640" Drop: 1.97"
(to sharp edge of seam at toe of float)
Pump Assem: 7020584 (synthetic)
RET Spring: 7004597 Size: .025"
DUR Spring: 7011385 Size: .045"
Pump Rod: 7013276 Length 2-3/4"
Pump Jet: drill (2) Size: .030"
Jet Location: In Cluster
CAP cc/10 strokes: 15.0 - 18.0
Rod Set: .600 from air cleaner flange surface to top of pump rod
Power Piston Assy: None
act spring (blank) Oz Color (blank)
Power Valve Assy: None
Power Rest: None Size: (blank)
Metering Rod: (blank) Spring: (blank)
Rod Size, Power (blank) Econ: (blank)
Cut-In down at: (blank) "Up" at: (blank)
MM. Jets: 390 cc, 60 degree, 7008668 "C"
Choke Housing: None (The next 14 lines available for the Choke Description are blank)
Float Bowl (Finish) Float Bowl and Body Number: 7013258
Venturi Size: 1-5/16"
Cluster: 7016687 Boost Size: 1/8
Nozzle: 7015151 rel zero
Idle Tube: None Size: (blank)
Channel Rest: None Size: (blank)
Hi-Speed Bleed: drill (2) Size: .034
L.I.A.B: None
Idle Bleed: None
Top Bleed: None
Side Bleed: None
Insert: (2) 7008866 (trumpet)
Radial Tubes: (blank) Size: (blank)
Crossover Chan: None Main Well Chan: None
Throttle Body Assem: 7027776 (2*)
Body & Bowl Assem: (blank)
Thr Body No: 7013262 Bore: 1-11/16
Thr Valve: 7027791 Angle 15 degrees
Idle Needle: None
Idle Needle Orifice:
All drilling info is blank
I will finish the document later
Tom Vaught
__________________
"Engineers do stuff for reasons" Tom Vaught
Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
Last edited by Tom Vaught; 03-07-2020 at 04:17 PM.
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