Quote:
Originally Posted by Tom Vaught
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
|
So here is the last part of the document (mostly just final Info)
Other: 7013264 thr shaft & lever assy
7015106 throttle body gasket
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
7013250 pump shaft & lever assy cast baffle in air horn 7021007 air horn
(2*) 7013783 throttle lever return spring "dag" treatment on throttle valves.
throttle valves in vertical position at wot.
(3*) 7024953 pump squirter deflector installed over cluster
date 9-3-1963
Customer 1964 2G Pontiac 389 cu in A/T & Syn (Front)
Pow. Pak for Pow Pak assys 7024172 & 7024174
Model 7024178 Similar to 7024078
Tom V.
If you copy the info in a Excel or Word Spreadsheet you can combine the info on one page.
This is the info for the Front Carb on a 1966 Tri-Power System from Rochester Products.
Basically, they gave you part numbers and "additions to the basic 2 G carb as well as Flow Test set points.
No different from what Holley did years ago. No magic here.
Spec No 1 (as released)