[Tom Vaught]

Lots of differences with this 1965-66 GTO Carb


REAR CARB

The 1966 Pontiac Tri-Power Carburetors information, as requested.
(For verification of the Carburetor Calibrations that you have on your 1966 Engines.


I will post the Rear Carb: 7025179 info now. Same format, again, from the Rochester Products People
in the way the information is presented by them.

Air Horn Number: 7013885 (1)
Venting: Internal 3/16" dia hole in scoop
External Venting: None
Support: None
Needle Seat: 7027846 Size: .086:
Float Valve: 7022782 Pull Clip: 7006474
Float Assembly: 7012028 Spring: None
Fuel Level: .730" at 6.0 psi
Mech. Setting: .640" Drop: 1.97"
(to sharp edge of seam at toe of float)
Pump Assem: 7032280 (synthetic)
RET Spring: 7004597 Size: .025"
DUR Spring: 7011385 Size: .045"
Pump Rod: 7028763 Length 2-3/4"
Pump Jet: drill (2) Size: .030"
Jet Location: In Cluster
CAP cc/10 strokes: 16.5 - 19.5
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: 7029684
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: 7029685 (2*)
Body & Bowl Assem: (blank)
Thr Body No: 7025611 Bore: 1-11/16
Thr Valve: 7027791 Angle 15 degrees

Idle Needle Orifice:
All drilling info is blank

So here is the last part of the document (mostly just final Info)
Other: 7029686 thr shaft & lever assy
7015345 throttle body gasket
7029688 Thr Lever
thr shaft offset .027 - .033

no spark port info

Test Specification 7022221

Min Air .95/ lbs min max
Box Balance 18" Hg - 3" Hg
(Note all 2 BBL carbs are tested at 3" of mercury (TV)

Remarks: (1*) pump shaft & lever assy, cast baffle in air horn, 7021007 air horn
Remarks: (2*) 7013249 needle seat screen

(3*) 7029689 throttle lever return spring "dag" treatment on throttle valves.
throttle valves in vertical position at wot.



date 3-26-1966
Customer 1965-6 2G Pontiac GTO 389 cu in A/T & Syn (Front)
Pow. Pak for Pow Pak assys 7024172 & 7024174
Model 7025179 Similar to 7024174

lots of changes on this one TV GTO listed for the first time in the sheets I am posting


Tom V.