#81  
Old 03-29-2020, 11:56 AM
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I HAVE CONFIRMED that the information for Pontiac Tri-Power FRONT CARB 7024179 is
correct (as previously posted).
Tom Vaught

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  #82  
Old 03-29-2020, 01:03 PM
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I HAVE CONFIRMED that the information for Pontiac Tri-Power FRONT CARB 7024078 is
correct (as previously posted).
Tom Vaught

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  #83  
Old 03-29-2020, 04:37 PM
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I HAVE CONFIRMED that the information for Pontiac Tri-Power FRONT CARB 7024079 is
correct (as previously posted).
Tom Vaught

I will check more postings tomorrow.

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  #84  
Old 03-29-2020, 05:05 PM
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This chart is not mine. I've posted it before. It is a simple way to find the info you need to find correct carb and manifold numbers for all Pontiac Tripowers--except the '57, '58.
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  #85  
Old 03-29-2020, 05:27 PM
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Quote:
Originally Posted by Dick Boneske View Post
This chart is not mine. I've posted it before. It is a simple way to find the info you need to find correct carb and manifold numbers for all Pontiac Tripowers--except the '57, '58.
Thanks for posting the info even if it as not yours originally.

The Rochester Products People sent me a Hand Written Page with the
1964-1966 information but this sheet now gives me all of the carb applications.

Thanks Again.

Tom Vaught

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  #86  
Old 03-30-2020, 03:11 AM
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Quote:
Originally Posted by Dick Boneske View Post
This chart is not mine. I've posted it before. It is a simple way to find the info you need to find correct carb and manifold numbers for all Pontiac Tripowers--except the '57, '58.
Wrong front carb for 1966 389 A/T.

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  #87  
Old 04-02-2020, 05:06 PM
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I HAVE CONFIRMED that the information for Pontiac Tri-Power FRONT CARB 7025178 is
correct (as previously posted).
Tom Vaught

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  #88  
Old 04-02-2020, 05:17 PM
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Quote:
Originally Posted by Kenth View Post
Wrong front carb for 1966 389 A/T.
Actually the Chart posted by Dick B agrees with the Rochester Products info.
Rochester Products says for the 1966 389 front carb you could have two different part numbers for each engine:

1966 389 engines used either the 7024178 carb or the 7025178 carb.

1966 421 engines used either the 7024078 carb or the 7025078 carb.

So the chart provided by Dick B is correct but not totally correct as it does not also include the other 389 carb mentioned above. Most likely the same will be evident for the 421 info when I check it.

I believe the chart does not list all of the correct carbs just one part number vs two part numbers for a given position/model year.

Tom V.

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Old 04-03-2020, 03:31 AM
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The chart shows 7025178 for both M/T and A/T for 1966 389.
This is obviously not correct since 1966 389 w/A/T uses 7024178.
The 7025178 appeared first on 1965 389 M/T and was carried over to 1966 389 M/T.

This info is from Delco Rochester Bulletin 9C-640 Date December, 1965, Delco Rochester Bulletin 9C-627 Date May, 1967 and the 1966 Tempest Chassis Shop Manual.
Also, the tag on my original 1966 GTO Tripower A/T front carb shows 7024178.

The chart is wrong on the 1966 421 front carb as well, should be 7024078 for A/T.

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Last edited by Kenth; 04-03-2020 at 03:52 AM.
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  #90  
Old 04-04-2020, 07:59 PM
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Ok I see where the confusion is. And again your info agrees with mine, except:

The Rochester People on their hand written sheet clearly identify different carb numbers for both the 64 and 65 Front and Rear carbs when using a A/T or using a M/T.

Their sheet does not have that extra note above the 1966 carburetors.
Possible just an oversite on their copying the 1966 carb numbers.

They had plenty of room to add that Front A/T Front M/T etc info on the area above the
1966 information.

I followed their handwritten sheet exactly. But it may not be totally correct based on your info as far as designating A/T vs M/T.

So Dick's posted info from whatever has some errors but we seem to be in agreement except for one group of headings for the 1966 carbs. (Same headings used for 1964 and 1965). The info does mention specifically the Air Injection Reactor Center Carb 7036175
Do you show that info Kenth?

Tom V.

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  #91  
Old 04-06-2020, 09:08 PM
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Information for Carb 7025078 has been verified as correct.

Tom V.

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  #92  
Old 04-10-2020, 12:41 PM
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Information for Carb 7025079 has been verified as correct.

Tom V.

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  #93  
Old 04-16-2020, 10:13 AM
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Having trouble posting new info on the remaining carbs as I get a message that PMs to members limited to 1000 characters and the corrected page is 3800 letters long.
We may have a duplicate post of info because of this by posting on the "Thread Page"

Tom V.

Here is the info on 7026075 again (possibly)

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.

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  #94  
Old 04-23-2020, 10:36 AM
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I have verified, after a relook at the 1966 Tri-Power Carb Information, that the info I have posted is correct and matched the Rochester Provided Sheets.

I will go thru the 1965 Tri-Power Carb Info and will identify where cars are the same for multiple years (like the end carbs). The following carb for 1965 should match the info I posted for the 1966 carbs. here are the Carb Part Numbers.

End carbs the same as the 1966 posted info:

1965 carbs: 389 Front Carbs (7024178, 7025178) 421 Front Carbs (7024078, 7025078) 389 Rear Carbs (7024179, 7025179) 421 Carbs 7024079, 7025079)

I will start posting 1965 Center Carb info tomorrow or at a later time.

Tom V.

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  #95  
Old 04-25-2020, 08:12 AM
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Quote:
Originally Posted by Tom Vaught View Post
Some background information:

I worked for the Ford Motor Company, for 39 years, at their Research & Engineering Center in Dearborn Michigan.

Across the street, from the R&E Center is the HENRY FORD MUSEUM of AMERICAN INNOVATION. Inside the Museum is a 1965 Pontiac GTO with a Tri-Power Engine and the hood is open for all to see the special Tri-Power Engine.
A sign above the car says the car represents "POWER".

https://www.thehenryford.org/visit/henry-ford-museum/

I used to eat my lunch inside the Museum occasionally and sat close to the 1965 GTO.
I did not really pay much attention to the car as it was a 1965 GTO and I owned a 1964 GTO.

One day I actually LOOKED at the 1965 GTO engine and noticed that there were several GLARING ERRORS with the way that the 1965 Tri-Power Intake and Carbs were assembled and mounted on the engine.

I spoke with the Curator (manager) of the 'Automotive Displayed' vehicles and told him there were some things wrong with his 1965 GTO.

So we went to look at the car and I showed him each one of the mistakes on the engine.
He was not happy (as they had paid a bunch of money for this 'restored" 1965 GTO.) I will not mention the amount.

So I offered to correct the mistakes on the Engine Tri-Power System.
I would do this for free but I would try to get donations of parts and information from Pontiac people
and from GM Rochester Products Engineering that might be available.

I will not add any thing else to that story except to say that Rochester Products was one of the companies who offered to help with the restoration of the carburetors as well as carb rebuild/ CALIBRATION information.

Pontiac Engineering no longer exists and neither does the Rochester Products carburetor Division,
they disappeared during the GM bankruptcy.

The other thing is Rochester Products Sent Me The Information vs someone stealing the information from a GM location. This was so I could make sure the Carburetor calibrations were "Spot On" for the Museum car and the
1965 Tri-Power system. My daughter, the Lawyer, says I have no issues with providing this info to Pontiac members.

So who would like to know what the real Tri-Power Carb calibrations looked like?
I provided a lot of the Holley Carb Info on the Holley Carbs in another thread.
I worked for Holley and they gave me the "BOOKS" with the info.
This thread would be a similar format.

Once we got past the "interested or not interested posts" I would start the
passing on of the carb info for the 1964, 1965, and 1966 Tri-Power Carb systems.

Post up your thoughts.

Tom Vaught
Very interesting Thread! I have a '64 GTO that originally had a 4-barrel carb on it but was converted, by the previous owner, to a '65 Tri-Power set-up on '68 H.O. heads. I have the original intake/carb setup but not the heads. Will probably keep the Tri-Power setup on it; it just looks Cool!

  #96  
Old 04-25-2020, 08:22 AM
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I will say hello and welcome to the PY Board.

I have family in Kansas and know the Hands, Tom Wilhite and family, Jim Brady and Family, Clay Phillips, Mike Cooper and wife, Sam Jackson, Mark Schottler and his dad when his dad ran a shop that did machine work on Pontiacs. His dad has passed.

Tri-Powers are cool and this thread is purely to pass on technical specs given to me many years ago when I did some free work for the Henry Ford Museum on their 65 GTO.
I will PM you with more contact info and questions.

Tom V.

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  #97  
Old 04-25-2020, 08:53 AM
vwalburn vwalburn is offline
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Thanks again! Just trying to figure out the differences between '64, '65 and '66 Tri-power set-ups. Like I said, I have a '65 set-up on a '64 GTO 389. Center carbs are different between '65 and '66, right? End carbs are the same? Is there a thread that covers the differences in the linkages and choke set-ups? May be asking too many questions on this thread. I need to figure out how to copy/paste threads to keep them for myself. Thanks again!

  #98  
Old 04-25-2020, 10:28 AM
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Yes, Center Carbs are different from 1965 to 1966.
In Calibrations, in how the carbs bolt down to the intakes, and how the Rochester Engineers did the Choke Systems (to name just a couple of differences).

The End Carbs were mostly 1964 Calibrations or 1965 Calibrations for the carbs.
If you look at the info I have posted to date I have updated the 1965 end carbs with the correct changes made and the Rochester Products People made a number change to the carbs which helps to determine a change.

In order to create the information for the website I took the info from the sheets, transferred it to an excel file tab, and then later transferred that info from the tab to the PY Board Post.

You should be able to just copy the info for one carb and directly post it into a excel spreadsheet that has a row height of 24 and a column "C" width of 85.64 and it should fit perfectly.

Tom V.

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  #99  
Old 05-03-2020, 09:33 AM
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Bringing the Previous Post back to the top on the 1965 & 1966 End Carbs.



So what were the changes from 1965 to 1966?

I will list the carb numbers for the 1965 carbs that are the same Calibration as the
1966 Carbs"

Front A/T Carb: 7024178 Same for 1965 and 1966 389 Engines
Front A/T Carb: 7024078 Same for 1965 and 1966 421 Engines

Front M/T Carb: 7025178 Same for 1965 and 1966 389 Engines
Front M/T Carb: 7025078 Same for 1965 and 1966 421 Engines



Rear A/T Carb: 7024179 Same for 1965 and 1966 389 Engines
Rear A/T Carb: 7024079 Same for 1965 and 1966 421 Engines

Rear M/T Carb: 7025179 Same for 1965 and 1966 389 Engines
Rear M/T Carb: 7025079 Same for 1965 and 1966 421 Engines

1965 TRI-POWER CENTER CARB UNIQUE PART NUMBERS TO BE POSTED

The 1965 Center Carbs are a DIFFERENT Calibration vs the 1966 Center Carbs
(I will post the SIX UNIQUE 1965 CENTER CARB CALIBRATIONS NEXT)

The 1965 Center carb calibrations I will post are:

1965 Center A/T Carb: 7025173 389 Engines
1965 Center A/T Carb: 7025177 389 Engines

1965 Center A/T Carb: 7025074 421 Engines
1965 Center A/T Carb: 7025070 421 Engines


1965 Center M/T Carb: 7025175 389 Engines

1965 Center M/T Carb: 7025075 421 Engines

Tom Vaught

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  #100  
Old 05-07-2020, 04:34 AM
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Tom V, will you post the correct Rochester info on 7026074?
Thanks, Kenth

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