[Tom Vaught]

FRONT 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 Front Carb: 7025078 today. I will follow the same format at the Rochester Products People in the way the
in the way the information is presented.

Air Horn Number: 7013885 (1)
Venting: Internal 3/16" dia 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: 446 cc, 60 degree, 7008673 "B"

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: 7031091 (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

So here is the last part of the document (mostly just final Info)
Other: 7013264 thr shaft & lever assy
7015345 throttle body gasket

7011897 Lever Front Carb Act
7029689 Spring-thr. Ret. 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*) 7013249 needle seat screen
7028757 pump shaft & lever assy cast baffle in air horn 7021007 air horn gasket

(2*) 7013783 throttle lever return spring "dag" treatment on throttle valves.
throttle valves in vertical position at wot.

(3*) 7029689 throttle lever return spring "dag" treatment on Throttle Valves
Throttle Valves in Vertical Position at WOT

date 3-26-1966
Customer 1965 - 1966 2G Pontiac & GTO 389 cu in Syn (Front)
Pow. Pak for Pow Pak assys 7024172 & 7024174
Model 7025078 Similar to 7024178 (except for jetting )

Tom V.