#41  
Old 03-08-2020, 04:38 PM
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TURNS OUT THERE ARE SOME DIFFERENCES BETWEEN THE PREVIOUS CARB POSTED
and the one I am posting now.

CENTER CARB 1966 421 engine Syn Trans

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 Center Carb: 7026074 info now. Same format, again, from the Rochester Products People
in the way the information is presented by them.

Air Horn Number: 7031588 (1)
Venting: Internal 7007199 Vent Tube
External Venting: Idle Vent
Support: None
Needle Seat: 7026305 Size: .120
Float Valve: 7022779 Pull Clip: 7006474
Float Assembly: 7012028 Spring: None
Fuel Level: .625" at 6.0 psi
Mech. Setting: .594" 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: 7025575 Length 3.06"
Pump Jet: drill (2) Size: .026"
Jet Location: In Cluster
CAP cc/10 strokes: 18.0 - 21.0
Rod Set: .952 from air cleaner flange surface to top of pump rod
Power Piston Assy: 7012266
act spring 7012265 Oz 8 Color (green)
Power Valve Assy: 7011989
Power Rest: 7010148 Size: (.048)
Metering Rod: (blank) Spring: (blank)
Rod Size, Power (blank) Econ: (blank)
Cut-In down at: 11 "Up" at: 8 all in at 6" hg

MM. Jets: 322 cc, 60 degree, 7008662 "C"
7013333 Idle Compensator Assy:
(140 degree (+ - 10 F) Opening Temp

Choke Housing: (2*) (Some of the next 14 lines available for the Choke Description are blank)
Here are the ones with Info:
Valve No: 7033443 Angle: 20 degrees
Cam No: 7020541
Choke Link: 7019524 Length: 2.671"
wo Kick: .143 - .183 Second Step: .090 .100
Vacuum Break: 25 degrees + - 1.5 degrees (.168 - .192)

Float Bowl (Finish) Float Bowl and Body Number: 7031576
Venturi Size: 1-3/16"
Cluster: 7032380 (4*) Boost Size: 1/8
Nozzle: 7012877 rel .049 - .061
Idle Tube: 7011031 "C" Size: .031
Channel Rest: 7011523 Size: .046
Hi-Speed Bleed: drill (2) Size: .028
L.I.A.B: None
Idle Bleed: None
Top Bleed: .039 over idle tube
Side Bleed: .033
Insert: (2) 7008866 (trumpet)
Radial Tubes: (blank) Size: (blank)
Crossover Chan: .125 Main Well Chan: None

Throttle Body Assem: 7031569
Body & Bowl Assem: (blank)
Thr Body No: 7031597 Bore: 1-11/16
Thr Valve: 7008903 Angle 10 degrees
Idle Needle: 7029605 angle: 20 degrees
Idle Needle Orifice: .074 - .078
All drilling info is blank

Port Punch Length: .187 Width: .030
Port Punch Loc: .177 Top Valve Top Slot
Other: 7032290 throttle body gasket
7020778 thr shaft lever assy
7024885 throttle lever
No Hole in thr valve
thr shaft offset .017 - .023

no spark port info

Test Specification 7022221

Min Air: .45/ lbs min Idle Air rate: .55 lbs min
Box Balance 17" Hg - 3" Hg
(Note all 2 BBL carbs are tested at 3" of mercury (TV)

Remarks: 7013333 idle comp assy
140 degrees F + - 10 degrees F opening temp

(1*) 7021007 air horn gasket 7031590 nut - fuel inlet bend pump lever tang to open idle vent
with .020 gage between thr valve & bore on side opposite idle needle.
(2*) 7026097 vacuum break control assy 7026098 remote choke coil assy
(3*) Service Pump Setting 1-21/64 + - 1/64 from top of die cast air horn ring to top of pump rod
(4*) .026 dia hole aspirator to main well bleed


date 3-19-1966 (notice the date change TV)
Customer 1966 2G Pontiac (SYN) 421 engine A/C -NON A/C Center

Tom V.

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  #42  
Old 03-09-2020, 02:25 PM
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7024078 Front Carb very similar to 7024178 Front Carb

FRONT CARB 1966 421 engine (A/T & Syn Trans)

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

The Front Carb: 7024078 I will follow the same format as 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: 426 cc, 60 degree, 7008671 "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 (3*) 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 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
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 421 cu in A/T & Syn (Front)
Pow. Pak for Pow Pak assys 7024172 & 7024174
Model 7024078 Similar to 7023078

Tom V.

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  #43  
Old 03-10-2020, 09:58 AM
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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.

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  #44  
Old 03-10-2020, 12:11 PM
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I'd like to see the 1965 Calibrations as well. Thank you

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2005 GTO Quick Silver/Red
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  #45  
Old 03-10-2020, 03:27 PM
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We still have several of the 1966 sheets to post and then the 1965 info will be next.
More than a few 65 sheets also. I hope the Pontiac Guys are learning from this exercise.

Tom V.

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  #46  
Old 03-10-2020, 07:12 PM
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Is the needle/seat on the 1965 rear carbs the same as 1966 that you have posted ?

  #47  
Old 03-10-2020, 09:09 PM
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The Rear Carb uses the same calibration (same needle and seat, as well as other parts) on the 389 1965 engine and the 389 1966 engine. Carb number 3025179 (Manual Trans Engines).

Tom V.

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  #48  
Old 03-10-2020, 10:01 PM
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Tom: Thanks for the quick response. Is the needle/seat available as a nos part, or from parts stores made by other manufacturers?

  #49  
Old 03-10-2020, 10:17 PM
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At one time, the Needle and Seat was available as part of the Rochester Tri-Power Kits
from NAPA. I have not followed those parts for many years. I do not rebuild carbs for people. Dick B, John Hargrove, and others do a fine job with that task.

Being a Holley Guy, I have lots of rebuild parts for the popular Holley High Performance Carbs I own. Somewhere in the shop is ONE SET of NAPA carb kits for my 64 GTO if I ever put the original carbs back on the car. Not likely in the near future.

So maybe too much info vs just saying talk to Dick B, Jon H, and the carb builder in Ohio.

Not my deal. Rochester carbs even though I probably have 100 cores in bins I have collected over the years. I will have to go thru my lists and make a search for correct Air Horns, Main Bodies, and Throttle Bodies for the Tri-Power Systems and put them up for sale.

Tom V.

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Last edited by Tom Vaught; 03-10-2020 at 10:58 PM.
  #50  
Old 03-10-2020, 10:37 PM
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Perhapes Dick Boneske and John H. might respond to my question !

  #51  
Old 03-10-2020, 11:00 PM
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They have a wealth of knowledge and between the two of them I would say you have a high probability of getting your questions answered.

This thread/topic is solely to post up info on the Tri-Power Carburetor Build Part Numbers and drill info for the carburetors.

Maybe you could start your own topic/question addressed to both of them. Words above too long for the topic line.

Tom V.

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  #52  
Old 03-11-2020, 04:29 PM
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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: 7025178 today. I will follow the same format at the Rochester Products People in the way the
in the way the information is presented. More changes on this one than expected.

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: 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: 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 7025178 Similar to 7024178

Tom V.

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  #53  
Old 03-11-2020, 09:10 PM
vwalburn vwalburn is offline
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Default Holy Sh@#!

I have a '64 GTO with a '65 Tri-Power Manifold and carbs; which I believe were the same for '64 and '65 but center carb changed in '66? I'll need to sit down and start reading this thread from the beginning. A lot of info here. I'm currently changing my center float because it filled up with fuel. Any advice on maintaining my Tri-Power is greatly appreciated. Carbs were rebuilt by last owner about 8 years ago and have about 6,000 miles on them. Would changing just the float at this time be advised or should I rebuild the whole carb or carbs?

  #54  
Old 03-11-2020, 10:24 PM
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If you post up the carb tag numbers off your 1965 Carbs when I do the 65 Carbs I will
prioritize those carbs for posting the info on them when I finish the rest of the 1966 carbs.

There are still new floats out there that people have purchased over the years.
I also have a supply of used floats that might still function properly for you if you cannot find a new float.
A bad float is not a good thing on a historical 1964 GTO.

Tom V.

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  #55  
Old 03-12-2020, 05:20 PM
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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.

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  #56  
Old 03-12-2020, 09:38 PM
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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: 7024079 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: .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: 426 cc, 60 degree, 7008671 "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 (4*) 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: 7027768 (3*)
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: 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*) 7013250 pump shaft & lever assy, cast baffle in air horn, 7021007 air horn
Remarks: (2*) 7013249 needle seat screen
(3*) 7013783 throttle lever return spring "dag" treatment on throttle valves.
throttle valves in vertical position at wot.
(4*) 7024953 pump shooter deflector installed over cluster


date 3-26-1966
Customer 1964 2G Pontiac 421 cu in A/T & Syn (Rear)
Pow. Pak for Pow Pak assys 7024076 & 7024077
Model 7024079 Similar to 7023079

A few changes on this one TV GTO no listed yet here.

Tom V.

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  #57  
Old 03-13-2020, 04:53 AM
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Kenth Kenth is offline
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Quote:
Originally Posted by Tom Vaught View Post
TURNS OUT THERE ARE SOME DIFFERENCES BETWEEN THE PREVIOUS CARB POSTED
and the one I am posting now.

CENTER CARB 1966 421 engine Syn Trans

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 Center Carb: 7026074 info now. Same format, again, from the Rochester Products People
in the way the information is presented by them.

Air Horn Number: 7031588 (1)
Venting: Internal 7007199 Vent Tube
External Venting: Idle Vent
Support: None
Needle Seat: 7026305 Size: .120
Float Valve: 7022779 Pull Clip: 7006474
Float Assembly: 7012028 Spring: None
Fuel Level: .625" at 6.0 psi
Mech. Setting: .594" 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: 7025575 Length 3.06"
Pump Jet: drill (2) Size: .026"
Jet Location: In Cluster
CAP cc/10 strokes: 18.0 - 21.0
Rod Set: .952 from air cleaner flange surface to top of pump rod
Power Piston Assy: 7012266
act spring 7012265 Oz 8 Color (green)
Power Valve Assy: 7011989
Power Rest: 7010148 Size: (.048)
Metering Rod: (blank) Spring: (blank)
Rod Size, Power (blank) Econ: (blank)
Cut-In down at: 11 "Up" at: 8 all in at 6" hg

MM. Jets: 322 cc, 60 degree, 7008662 "C"
7013333 Idle Compensator Assy:
(140 degree (+ - 10 F) Opening Temp

Choke Housing: (2*) (Some of the next 14 lines available for the Choke Description are blank)
Here are the ones with Info:
Valve No: 7033443 Angle: 20 degrees
Cam No: 7020541
Choke Link: 7019524 Length: 2.671"
wo Kick: .143 - .183 Second Step: .090 .100
Vacuum Break: 25 degrees + - 1.5 degrees (.168 - .192)

Float Bowl (Finish) Float Bowl and Body Number: 7031576
Venturi Size: 1-3/16"
Cluster: 7032380 (4*) Boost Size: 1/8
Nozzle: 7012877 rel .049 - .061
Idle Tube: 7011031 "C" Size: .031
Channel Rest: 7011523 Size: .046
Hi-Speed Bleed: drill (2) Size: .028
L.I.A.B: None
Idle Bleed: None
Top Bleed: .039 over idle tube
Side Bleed: .033
Insert: (2) 7008866 (trumpet)
Radial Tubes: (blank) Size: (blank)
Crossover Chan: .125 Main Well Chan: None

Throttle Body Assem: 7031569
Body & Bowl Assem: (blank)
Thr Body No: 7031597 Bore: 1-11/16
Thr Valve: 7008903 Angle 10 degrees
Idle Needle: 7029605 angle: 20 degrees
Idle Needle Orifice: .074 - .078
All drilling info is blank

Port Punch Length: .187 Width: .030
Port Punch Loc: .177 Top Valve Top Slot
Other: 7032290 throttle body gasket
7020778 thr shaft lever assy
7024885 throttle lever
No Hole in thr valve
thr shaft offset .017 - .023

no spark port info

Test Specification 7022221

Min Air: .45/ lbs min Idle Air rate: .55 lbs min
Box Balance 17" Hg - 3" Hg
(Note all 2 BBL carbs are tested at 3" of mercury (TV)

Remarks: 7013333 idle comp assy
140 degrees F + - 10 degrees F opening temp

(1*) 7021007 air horn gasket 7031590 nut - fuel inlet bend pump lever tang to open idle vent
with .020 gage between thr valve & bore on side opposite idle needle.
(2*) 7026097 vacuum break control assy 7026098 remote choke coil assy
(3*) Service Pump Setting 1-21/64 + - 1/64 from top of die cast air horn ring to top of pump rod
(4*) .026 dia hole aspirator to main well bleed


date 3-19-1966 (notice the date change TV)
Customer 1966 2G Pontiac (SYN) 421 engine A/C -NON A/C Center

Tom V.
I guess this is the 7026075 unit?

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  #58  
Old 03-13-2020, 05:00 AM
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Kenth Kenth is offline
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Info on inlet needle valve pull clip on end carbs from 1963 says none used.
Info on inlet needle valve pull clip on end carbs from 1966 says clip #7006474 is used.

Was there an issue with sticking inlet valves on end carbs before the use of the pull clip? What year did they add the clip?

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  #59  
Old 03-13-2020, 10:59 AM
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Going thru the 1966 Tri-Power Applications so far, Kenth, some have the "pull clip" and some do not. I believe the older stuff used a solid steel needle and seat assy.
Then Pontiac and others went to the Viton (or other material rubber tipped needles).

These needles sometimes stuck in the seat if the gas evaporated, The pull clip would very gradually remove the needle from the seat as the gas evaporated, then No Stuck Needle.

So far posting the 66 info, the clip seems to be random because I am going by the sheet part numbers and have not gone to the 1965 sheets to see where the clip might have first appeared.

Tom V.

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  #60  
Old 03-14-2020, 12:19 PM
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CENTER CARB 1966 421 engine (MANY calibration Changes on this one - TV)

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 Center Carb: 7026075 info now. Same format, again, from the Rochester Products People
in the way the information is presented by them. This carb & one more 421 carb & 1 more 1966 389 carb

Air Horn Number: 7031588 (1)
Venting: Internal 7007199 Vent Tube
External Venting: Idle Vent
Support: None
Needle Seat: 7026305 Size: .120
Float Valve: 7022779 Pull Clip: 7006474
Float Assembly: 7012028 Spring: None
Fuel Level: .625" at 6.0 psi
Mech. Setting: .594" 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: 7025575 Length 3.06"
Pump Jet: drill (2) Size: .026"
Jet Location: In Cluster
CAP cc/10 strokes: 18.0 - 21.0
Rod Set: .952 from air cleaner flange surface to top of pump rod (3*)
Power Piston Assy: 7012266
act spring 7012265 Oz 8.5 Color (green)
Power Valve Assy: 7011989
Power Rest: 7010148 Size: (.048)
Metering Rod: (blank) Spring: (blank)
Rod Size, Power (blank) Econ: (blank)
Cut-In down at: 11 "Up" at: 8 all in at 6" hg

MM. Jets: 322 cc, 60 degree, 7008662 "C"
7013333 Idle Compensator Assy:
(140 degree (+ - 10 F) Opening Temp

Choke Housing: (2*) (Some of the next 14 lines available for the Choke Description are blank)
Here are the ones with Info:
Valve No: 7033443 Angle: 20 degrees
Cam No: 7020541
Choke Link: 7019524 Length: 2.671"
wo Kick: .143 - .183 Second Step: .090 .100
Vacuum Break: 29 degrees + - 1.5 degrees (.214 - .238)

Float Bowl (Finish) Float Bowl and Body Number: 7031576
Venturi Size: 1-3/16"
Cluster: 7032380 (4*) Boost Size: 1/8
Nozzle: 70112877 rel .049 - .061
Idle Tube: 7011031 "C" Size: .031
Channel Rest: 7011523 Size: .046
Hi-Speed Bleed: drill (2) Size: .028
L.I.A.B: None
Idle Bleed: None
Top Bleed: .039 over idle tube
Side Bleed: .033
Insert: (2) 7008866 (trumpet)
Radial Tubes: (blank) Size: (blank)
Crossover Chan: .125 Main Well Chan: None

Throttle Body Assem: 7032569
Body & Bowl Assem: (blank)
Thr Body No: 7031597 Bore: 1-11/16
Thr Valve: 7008903 Angle 10 degrees
Idle Needle: 7029605 angle: 20 degrees
Idle Needle Orifice: .074 - .078
All drilling info is blank

Port Punch Length: .187 Width: .030
Port Punch Loc: .177 Top Valve Top Slot
Other: 7032290 throttle body gasket
7020778 thr shaft lever assy
7024885 throttle lever
No hole in thr valve
thr shaft offset .017 - .023

no spark port info

Test Specification 7022221

Min Air: .45/ lbs min Idle Air rate: .55 lbs min
Normal Idle: .005 bet thr valve on side opp idle needle
Box Balance 18" Hg - 3" Hg
(Note all 2 BBL carbs are tested at 3" of mercury (TV)

Remarks: 7013333 idle comp assy
140 degrees F + - 10 degrees F opening temp

(1*) 7021007 air horn gasket 7031590 nut - fuel inlet bend pump lever tang to open idle vent
with .020 gage between thr valve & bore on side opposite idle needle.
(2*) 7026097 vacuum break control assy 7026098 remote choke coil assy
(3*) Service Pump Setting 1-21/64 + - 1/64 from top of die cast air horn ring to top of pump rod
(4*) .026 dia hole aspirator to main well bleed


date 3-19-1966
Customer 1966 2G Pontiac (Syn) 421 engine Non A/C Center
Pow. Pak for Pow Pak assys 7026077 & 7026174
Model 7026075 Similar to 7025061

Tom V.

__________________
"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.
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