#61  
Old 03-15-2020, 10:05 AM
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CENTER CARB 1966 389 engine (California carb) Lots of changes here

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: 7036175 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: .028"
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: 7010141 Size: (.041)
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: 312 cc, 60 degree, 7008661 "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: 7031625 (2*)
Venturi Size: 1-3/16"
Cluster: 7031293 (4*) Boost Size: 1/8
Nozzle: 7012877 rel .055
Idle Tube: 7011032 "C" Size: .032
Channel Rest: 7004520 Size: .048
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: 7031291
Body & Bowl Assem: (blank)
Thr Body No: 7031292 Bore: 1-11/16
Thr Valve: 7019299 Angle 10 degrees
Idle Needle: 7029605 angle: 20 degrees
Idle Needle Orifice: .074 - .078
Spark Port .030 x .090 loc. .045 + - .003
Top Valve Top corner Slot

Port Punch Length: .250 Width: .030
Port Punch Loc: .243 Top Valve Top Slot
Other: 7032290 throttle body gasket
7020778 thr shaft lever assy
7024885 throttle lever
.096 hole in thr valve
thr shaft offset .017 - .023

Spark Limits 3 Hg @ 1.1 lbs/min air min
12 Hg @ 2.3 lbs/min air min

Test Specification 7022221 & 7022224

Min Air: .65/ lbs min Idle Air rate: 1.05 lbs min
A.I.O Set Point 2.0 lbs min

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*) 7033388 Screw "off idle" air adjust
(3*) 7026097 vacuum break control assy 7026098 remote choke coil assy
(4*) .026 dia hole aspirator to main well bleed


date 3-19-1966
Customer 1966 2G Pontiac (Syn) CALIF. "389 Engine" A/C -Non A/C (center)
Pow. Pak for Pow Pak assys 7026174
Model 7036175 Similar to 7026175

Tom V.

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  #62  
Old 03-15-2020, 08:52 PM
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Tom fantastic information, really enjoying this thread. Great work. Thank you

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  #63  
Old 03-15-2020, 09:33 PM
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Quote:
Originally Posted by theamcguy View Post
Tom fantastic information, really enjoying this thread. Great work. Thank you
You are welcome. I think there is one or two 1966 carb configurations left to post and then I will go to the 1965 information.

Some may be easier, if the 1966 info matches the 1965 info.
If so I will just re-post the info identifying it as 1965 info and same as 1966.

Finally will do the 1964 info and follow same method as the 1965 info.

If there are differences from 1966, I will post the exact info from the model year sheet.

Tom V.

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Old 03-15-2020, 09:42 PM
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Thanks for posting this detailed information. It is great resource material to have available. As an educator, "information is power".

  #65  
Old 03-16-2020, 08:16 AM
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Thanks Mike.

421 MT Rear Carb Last one of the 1966 Listings.

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: 7025079 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: 7029690 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 (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: 7029685
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
Throttle Lever 7029688

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*) 7028757 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.
(4*) 7024953 pump shooter deflector installed over cluster


date 3-26-1966
Customer 1965-66 2G Pontiac 421 cu in Syn (Rear)
Pow. Pak for Pow Pak assys 7025077
Model 7025079 Similar to 7024079

SEVERAL changes on this one TV


Tom V.

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  #66  
Old 03-16-2020, 08:50 AM
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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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  #67  
Old 03-16-2020, 08:24 PM
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Glad I started with the 1966 Tri-Power Carbs first.

I think 64 and 65 Center carbs are going to be painful to post. LOL!

Here is the Carb Sheet for the 1965 Center Carb

CENTER CARB 1965 389 engine

The 1965 Pontiac Tri-Power Carburetors information, as requested.
(For verification of the Carburetor Calibrations that you have on your 1965 Engines.


I will post the Center Carb: 7025173 info now. Same format, again, from the Rochester Products People in the way the information is presented by them.

Air Horn Number: 7017911 (1)
Venting: Internal 7007199 Vent Tube
External Venting: Idle Vent (1*)
Support: None
Needle Seat: 7026336 Size: .101
Float Valve: 7022783 Pull Clip: 7006474
Float Assembly: 7000273 Spring: None
Fuel Level: .572" at 6.0 psi
Mech. Setting: 1.234" Drop: 1.97"
(to sharp edge of seam at toe of float)
Pump Assem: 7019518 (synthetic)
RET Spring: 7004597 Size: .025"
DUR Spring: 7011385 Size: .045"
Pump Rod: 7013998 Length 2.968"
Pump Jet: drill (2) Size: .026"
Jet Location: In Cluster
CAP cc/10 strokes: 15.0 - 18.0
Rod Set: .880 from air cleaner flange surface to top of pump rod
Power Piston Assy: 7006011
act spring 7006012 Oz 7.5 Color (yellow)
Power Valve Assy: 7011989
Power Rest: 7010138 Size: (.038)
Metering Rod: (blank) Spring: (blank)
Rod Size, Power (blank) Econ: (blank)
Cut-In down at: 9 "Up" at: 7 all in at 5" hg

MM. Jets: 299 cc, 60 degree, 7008660 "B"
7013333 Idle Compensator Assy:
(140 degree (+ - 10 F) Opening Temp
.136 dia.comp. bleed hole thru T.B.

Choke Housing: 7019476 (3*) bore 1/2
sleeve slot rel. .543 - .547
rest, front .187 rear .089
piston no. 7013888 rest none
Valve No: 7007151 Angle: 20 degrees
cover & coil assembly 7029583
coil 7006010 # 11
activity .398 - .422 rot
torque .214 - .240
stat set index (4*)
Fast idle adjust blank
Cam No: 7016086
Choke Link: 7019528 Length: 2.473
wo Kick: .143 - .183 Second Step: .051 .061
Vacuum Break: 20 degrees + - 3 degrees (EMI -19 method "C")

Float Bowl (Finish) Float Bowl and Body Number: 7019931
Venturi Size: 1-1/4"
Cluster: 7019937 Boost Size: 1/8
Nozzle: 7012362 (5*) zero
Idle Tube: 7011032 "C" Size: .032
Channel Rest: 7011523 Size: .046
Hi-Speed Bleed: drill (2) Size: .026
Dome Vent: drill (2) Size: .028
Idle Bleed: None
Top Bleed: .038 over idle tube
Side Bleed: none
Deflector: (2) 7009098
Radial Tubes: (blank) Size: (blank)
Crossover Chan: .125 Main Well Chan: None

Throttle Body Assem: 7020784
Body & Bowl Assem: (blank)
Thr Body No: 7019343 Bore: 1-7/16
Thr Valve: 7013795 Angle 11 degrees
Idle Needle: 7013116 angle: 15 degrees
Idle Needle Orifice: .070 - .002
Spark: none

Port Punch Length: Width:
Port Punch Loc:
Other: 7020783 throttle shaft lever assy
7013680 vented throttle body gasket
.081 dia hole in thr valve
Thr Lever: 7024885
thr shaft offset .017 - .023

Spark Limits blank

Test Specification 7022221

Idle Air rate: .79 lbs min
Min Air: .5 lbs min

Box Balance 18" Hg - 3" Hg
(Note all 2 BBL carbs are tested at 3" of mercury (TV)

Remarks: (1*) 7017442 pump act. Shaft & outside lever assy, 7007506 choke lever & link assy, 7002075 link 7021008 air horn gasket idle vent adj: bend pump lever tang to just open valve with .020 +/- .005 plug bet thr. Vlv. & bore side opposite idle needle.

(2*) 7006079 needle seat screen
(3*) 7019477 baffle in hsg. .053 dia hole in baffle.
(4*) Choke should just close at 75 degrees F when set on Index.
(5*) 7000291 defusser in nozzle.
(6*) (2) 7017918 .109 dia. Idle channel inserts .153 length pressed in flush +/- .002
(7*) Bottom Slot .032 +/- .004 below top of shaft
Note: 7028797 vac switch assy Adj to obtain 1.088 +/- .010 bet top of bosses on movable lever & top of switch at W.O.T.

date 6-11-1964
Customer 1965 2GC Pont. Pow. Pak. "389 Engine" Idle Comp (center) auto
7025172 Pow. Pak Assy 7025173 - Center 7025178 - Front 7025179 rear
Model 7025173 Similar to 7024173

This sheet is the most complicated of any calibration sheet I have looked at so far from Rochester Products.

Tom V.

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  #68  
Old 03-17-2020, 12:59 PM
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CENTER CARB 1965 389 engine
(very minor changes vs the other 1965 center carb sheet I posted)

The 1965 Pontiac Tri-Power Carburetors information, as requested.
(For verification of the Carburetor Calibrations that you have on your 1965 Engines.


I will post the Center Carb: 7025177 info now. Same format, again, from the Rochester Products People
in the way the information is presented by them. The second of the 1965 Center Carb Calibrations

Air Horn Number: 7017911 (1*)
Venting: Internal 7007199 Vent Tube
External Venting: Idle Vent (1*)
Support: None
Needle Seat: 7026336 (2*) Size: .101
Float Valve: 7022783 Pull Clip: 7006474
Float Assembly: 7000273 Spring: None
Fuel Level: .572" at 6.0 psi
Mech. Setting: 1.234" Drop: 1.97"
(to sharp edge of seam at toe of float)
Pump Assem: 7019518 (synthetic)
RET Spring: 7004597 Size: .025"
DUR Spring: 7011385 Size: .045"
Pump Rod: 7013998 Length 2.968"
Pump Jet: drill (2) Size: .026"
Jet Location: In Cluster
CAP cc/10 strokes: 15.0 - 18.0
Rod Set: .880 from air cleaner flange surface to top of pump rod
Power Piston Assy: 7006011
act spring 7006012 Oz 7.5 Color (yellow)
Power Valve Assy: 7011989
Power Rest: 7010138 Size: (.038)
Metering Rod: (blank) Spring: (blank)
Rod Size, Power (blank) Econ: (blank)
Cut-In down at: 9 "Up" at: 7 all in at 5" hg

MM. Jets: 299 cc, 60 degree, 7008660 "B"
7013333 Idle Compensator Assy:
(140 degree (+ - 10 F) Opening Temp
.136 dia.comp. bleed hole thru T.B.

Choke Housing: 7019476 (3*) bore 1/2
sleeve slot rel. .543 - .547
rest, front .187 rear .089
piston no. 7013888 rest none
Valve No: 7007151 Angle: 20 degrees
cover & coil assembly 7029583
coil 7006010 # 11
activity .398 - .422 rot
torque .214 - .240
stat set index (4*)
Fast idle adjust blank
Cam No: 7016086
Choke Link: 7019528 Length: 2.473
wo Kick: .143 - .183 Second Step: .051 .061
Vacuum Break: 20 degrees + - 3 degrees (EMI -19 method "C")

Float Bowl (Finish) Float Bowl and Body Number: 7019931
Venturi Size: 1-1/4"
Cluster: 7019937 Boost Size: 1/8
Nozzle: 7012362 (5*) zero
Idle Tube: 7011032 "C" Size: .032
Channel Rest: 7011523 Size: .046
Hi-Speed Bleed: drill (2) Size: .026
Dome Vent: drill (2) Size: .028
Idle Bleed: None
Top Bleed: .038 over idle tube
Side Bleed: none
Deflector: (2) 7009098
Radial Tubes: (blank) Size: (blank)
Crossover Chan: .125 Main Well Chan: None

Throttle Body Assem: 7020784 (6*)
Body & Bowl Assem: (blank)
Thr Body No: 7019343 Bore: 1-7/16
Thr Valve: 7013795 Angle 11 degrees
Idle Needle: 7013116 angle: 15 degrees
Idle Needle Orifice: .070 - .002
1st Drilling: .031 +/- .002 (7*)
Spark: none

Port Punch Length: Width:
Port Punch Loc:
Other: 7020783 throttle shaft lever assy
7013680 vented throttle body gasket
.081 dia hole in thr valve
Thr Lever: 7024885
thr shaft offset .017 - .023

Spark Limits blank

Test Specification 7022221

Idle Air rate: .79 lbs min
Min Air: .50 lbs min

Box Balance 18" Hg - 3" Hg
(Note all 2 BBL carbs are tested at 3" of mercury (TV)

Remarks: (1*) 7017442 pump act. Shaft & outside lever assy, 7007506 choke lever & link assy,
7002075 link

7021008 air horn gasket idle vent adj: bend pump lever tang to just open valve
with .020 +/- .005 plug bet thr. Vlv. & bore side opposite idle needle.
(2*) 7006079 needle seat screen
(3*) 7019477 baffle in hsg. .063 dia hole in baffle.
(4*) Choke should just close at 75 degrees F when set on Index.
(5*) 7000291 defusser in nozzle.
(6*) (2) 7017918 .109 dia. Idle channel inserts .153 length pressed in flush +/- .002
(7*) Bottom Slot .032 +/- .004 below top of shaft
Note: 7029693 vac switch assy Adj to obtain 1.100 +/- .010 bet top of bosses on movable lever & top of
switch at W.O.T.

date 6-3-1964
Customer 1965 2GC Pont. Pow. Pak. "389 Engine" Idle Comp (center) auto
7025172 Pow. Pak Assy 7025177 - Center 7025178 - Front 7025178 rear
Model 7025177 Similar to 7025173

This sheet is (except for 3 of 4 minor changes) is the same as the previous sheet I posted.
The difference being this sheet pre-dates the other 1965 center carb sheet I posted by about 8 days.


Tom V.

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  #69  
Old 03-17-2020, 07:20 PM
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CENTER CARB 1965 389 engine


The 1965 Pontiac Tri-Power Carburetors information, as requested.
(For verification of the Carburetor Calibrations that you have on your 1965 Engines.
This is the last Center Carb sheet for the 1965 389 Tri-Power Induction Systems

I will post the Center Carb: 7025175 info now. Same format, again, from the Rochester Products People
in the way the information is presented by them. The second of the 1965 Center Carb Calibrations

Air Horn Number: 7017911 (1*)
Venting: Internal 7007199 Vent Tube
External Venting: Idle Vent
Support: None
Needle Seat: 7026336 (2*) Size: .101
Float Valve: 7022783 Pull Clip: 7006474
Float Assembly: 7000273 Spring: None
Fuel Level: .572" at 6.0 psi
Mech. Setting: 1.234" Drop: 1.97"
(to sharp edge of seam at toe of float)
Pump Assem: 7019518 (synthetic)
RET Spring: 7004597 Size: .025"
DUR Spring: 7011385 Size: .045"
Pump Rod: 7013998 Length 2.968"
Pump Jet: drill (2) Size: .026"
Jet Location: In Cluster
CAP cc/10 strokes: 15.0 - 18.0
Rod Set: .880 from air cleaner flange surface to top of pump rod
Power Piston Assy: 7011478 burnished piston
Act Spring 7005841 Oz 8 Color (white)
Power Valve Assy: 7017950
Power Rest: 7010131 Size: (.031)
Metering Rod: (blank) Spring: (blank)
Rod Size, Power (blank) Econ: (blank)
Cut-In down at: 9 "Up" at: 7 hg

MM. Jets: 330 cc, 60 degree, 7008663 "B"
Idle Compensator Assy: none

Choke Housing: 7019587 (3*) bore 1/2
sleeve slot rel. .573 - .577
rest, front .187 rear .089
piston no. 7013888 rest none
Valve No: 7007151 Angle: 20 degrees
cover & coil assembly 7019660
coil 7006894 # 12
activity .388 - .412 rot
torque .1975 - .2225
stat set index (4*)
Fast idle adjust blank
Cam No: 7016086
Choke Link: 7019528 Length: 2.473
wo Kick: .143 - .183 Second Step: .051 .061
Vacuum Break: 23 degrees + - 3 degrees (EMI -19 method "C")

Float Bowl (Finish) Float Bowl and Body Number: 7019928
Venturi Size: 1-1/4"
Cluster: 7019937 Boost Size: 1/8
Nozzle: 7012362 (5*) zero
Idle Tube: 7011033 "C" Size: .033
Channel Rest: 7009246 Size: .044
Hi-Speed Bleed: drill (2) Size: .026
Dome Vent: drill (2) Size: .028
Idle Bleed: None
Top Bleed: .038 over idle tube
Side Bleed: none
Deflector: (2) 7009098
Radial Tubes: (blank) Size: (blank)
Crossover Chan: .125 Main Well Chan: None

Throttle Body Assem: 7029351 (6*)
Body & Bowl Assem: 7029352
Thr Body No: 7029352 Bore: 1-7/16
Thr Valve: 7010178 Angle 11 degrees
Idle Needle: 7013116 angle: 15 degrees
Idle Needle Orifice: .068 - .072
1st Drilling: .029 - .033 (7*)
Spark: none

Port Punch Length: Width:
Port Punch Loc:
Other: 7020783 throttle shaft lever assy
7015148 throttle body gasket
Thr Lever: 7024885
thr shaft offset .017 - .023

Spark Limits blank

Test Specification 7022221
Min Air: .25 lbs min
Idle Air rate: .80 lbs min


Box Balance 18" Hg - 3" Hg
(Note all 2 BBL carbs are tested at 3" of mercury (TV)

Remarks: (1*) 7017442 pump act. Shaft & outside lever assy, 7007506 choke lever & link assy,
7002075 link

7021008 air horn gasket idle vent adj: bend pump lever tang to just open valve
with .020 +/- .005 plug bet thr. Vlv. & bore side opposite idle needle.
(2*) 7006079 needle seat screen
(3*) 7019477 baffle in hsg. .063 dia hole in baffle.
(4*) Choke should just close at 75 degrees F when set on Index.
(5*) 7000291 defusser in nozzle.
(6*) (2) 7017918 .109 dia. Idle channel inserts .153 length pressed in flush +/- .002
(7*) Bottom Slot .057 +/- .004 below top of shaft
Note: 7028797 vac switch assy Adj to obtain 1.088 +/- .010 bet top of bosses on movable lever & top of
switch at W.O.T.

date 6-11-1964 SAE 1-1/4" Spec 2
Customer 1965 2GC Pont. Pow. Pak. "289 Engine" (center) Syn. (They made a typo on the engine size)
7025174 Pow. Pak Assy 7025175 - Center 7025178 - Front 7025179 rear
Model 7025175 Similar to 7024175

This sheet has a lot of changes and is more like the 1st 1965 389 sheet I posted
So the production order would be 2nd sheet, then 1st sheet, and now this sheet.


Tom V.

This completes the 1965 389 Calibration Sheets, I will start on the 1965 421 sheets tomorrow.

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  #70  
Old 03-17-2020, 09:06 PM
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Tom,
Thank you for posting all of this information!
Could these specs help determine the cfm of these Tripowers?
Thanks,
Don

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1966 GTO

1966 421-9.3-1 comp-Race Tec 23cc Pistons
1966 Tri-Power
1967 670 Heads
Pontiac "Highlift" TriPower Cam by SpeedPro
DUR 214 Int 224 Exh @.050 - 107 ICL
LIFT .445" Int .465" Exh
Tri-Y-Headers by Tribal Tubes w/ Goerlich Mufflers
1966 Muncie Wide Ratio 4-Speed
1968-72 Chevy 12 Bolt Rear End w/ 3.73 rear gears
  #71  
Old 03-18-2020, 11:01 AM
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These specs are calibration specs.
When a 1964 or 1965 2GC Center Carb goes on the Rochester Products "Air Box", (the carb is installed inside an actual box, no air cleaner, and with Stoddard Solvent running thru the fuel passages), you get a flow number that has to meet a given specification at a minimum air flow in pounds of air mass per minute.

Same deal for the 2G End Carbs on all 3 years and the Center Carb on the 1966 engines. The specs are right on the sheets.

A Holley or Rochester Products Flow Stand is not the same thing as a Superflow Flow Bench that only passes air thru the carb. The Holley and Rochester Products Flow Stands SIMULATED the actual carb running on a engine at a given rpm (CFM) point.
Be it Idle Conditions, or under other conditions. Engine Dynometers were used to verify running engine carburetor performance using fuel flow rates thru the carb, air flow rates thru the test cell, and exhaust gas analyser information coming out of the exhaust.

So a CFM "Number" means little on a Engineering Build Sheet. They do list Pounds per Minute (Air Mass) specs though to make sure the Idle air/fuel is correct for the engine to idle properly.

Sean Murphy, former employer of Brad Urban, friend of Tom S, owner of Sean Murphy Induction, did a article on Rochester 2 BBL carbs about 10 years ago.

Here is the link. It talks about Carb CFM because racers like to talk to cfm numbers.
Carb Engineers, be them Holley Engineers or Rochester Engineers talk in lbs/min of idle air flow and Air Box "set points".

https://www.hotrod.com/articles/ctrp...g-carburetors/

I am diverging from posting the normal info, because the info I have been posting tells Carb Engineers, Rochester Products Engineers in this case, how to test on a Engineering Carb Test Stand a given carb to make sure it was acceptable for production.

Before people started racing carb CFM (vs actual Pounds per Minute of airflow at a agreed-upon test point), a Holley Air Box could test a Rochester 2 BBL and compare it to a Holley 2 BBL as far as pounds of air mass (using Stoddard Solvent as the fuel) one carb vs the other. Then the CFM racing started.

Autolite had their Carb Test Stands, Holley had theirs, (both at the Engineering Locations and at the Carb Build Plants.
Rochester basically did their Engineering/Testing in Rochester N.Y.

Read Sean's article, he is a good carb guy, better than most.

Tom V

No more History Lessons until I get all of the sheets posted.

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  #72  
Old 03-18-2020, 12:09 PM
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Quote:
Originally Posted by Kenth View Post
I guess this is the 7026075 unit?
7026074 Carb, Kenth look at the top of the sheets, the first few lines of info.
Each specific carb number is listed there vs looking at the bottom of the page
which is confusing in its statements at times.

Tom V.

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  #73  
Old 03-18-2020, 12:41 PM
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CENTER CARB 1965 421 engine


The 1965 Pontiac Tri-Power Carburetors information, as requested.
(For verification of the Carburetor Calibrations that you have on your 1965 Engines.
This is the first Center Carb sheet for the 1965 421 Tri-Power Induction Systems

I will post the Center Carb: 7025070 info now. Same format, again, from the Rochester Products People
in the way the information is presented by them. The first of the 1965 Center Carb Calibrations
The date on this carb sheet is 9/24/1964

Air Horn Number: 7017911 (1*)
Venting: Internal 7008915 Vent Tube
External Venting: Idle Vent
Support: None
Needle Seat: 7026336 (2*) Size: .101
Float Valve: 7022783 Pull Clip: 7006474
Float Assembly: 7000273 Spring: None
Fuel Level: .572" at 6.0 psi
Mech. Setting: 1.234" Drop: 1.97"
(to sharp edge of seam at toe of float)
Pump Assem: 7019518 (synthetic)
RET Spring: 7004597 Size: .025"
DUR Spring: 7011385 Size: .045"
Pump Rod: 7013998 Length 2.968"
Pump Jet: drill (2) Size: .026"
Jet Location: In Cluster
CAP cc/10 strokes: 15.0 - 18.0
Rod Set: .880 from air cleaner flange surface to top of pump rod
Power Piston Assy: 7006011
Act Spring 7006012 Oz 7.5 Color (yellow)
Power Valve Assy: 7011989
Power Rest: 7010136 Size: (.036)
Metering Rod: (blank) Spring: (blank)
Rod Size, Power (blank) Econ: (blank)
Cut-In down at: 9 "Up" at: 7 hg

MM. Jets: 299 cc, 60 degree, 7008660 "B"
Idle Compensator Assy: 7013333
(140 degrees F +/- 10 degrees Opening Temp

Choke Housing: 7019476 (3*) bore 1/2
sleeve slot rel. .543 - .547
rest, front .187 rear .089
piston no. 7013888 rest none
Valve No: 7007151 Angle: 20 degrees
cover & coil assembly 7029583
coil 7006010 # 11
activity .388 - .422 rot
torque .210 - .240
stat set index (4*)
Fast idle adjust blank
Cam No: 7016086
Choke Rod: 7019528 Length: 2.473
wo Kick: .143 - .183 Second Step: .051 .061
Vacuum Break: 20 degrees + - 3 degrees (EMI -19 method "C")

Float Bowl (Finish) Float Bowl and Body Number: 7019931
Venturi Size: 1-1/4"
Cluster: 7019937 Boost Size: 1/8
Nozzle: 7012362 (5*) zero
Idle Tube: 7011029 "C" Size: .029
Channel Rest: 7008545 Size: .055
Hi-Speed Bleed: drill (2) Size: .026
Dome Vent: drill (2) Size: .028
Idle Bleed: None
Top Bleed: .038 over idle tube
Side Bleed: none
Deflector: (2) 7009098
Radial Tubes: (blank) Size: (blank)
Crossover Chan: .125 Main Well Chan: None

Throttle Body Assem: 7020784 (6*)
Body & Bowl Assem:
Thr Body No: 7019343 Bore: 1-7/16
Thr Valve: 7013795 Angle 11 degrees
Idle Needle: 7013116 angle: 15 degrees
Idle Needle Orifice: .068 - .072
1st Drilling: .029 - .033 (7*)
Spark: none

Port Punch Length: Width:
Port Punch Loc:
Other: 7020783 throttle shaft lever assy
7013680 throttle body gasket
Thr Lever: 7024885
.081 dia hole thru throttle valve
thr shaft offset .017 - .023

Spark Limits blank

Test Specification 7022221
Min Air: .50 lbs min
Idle Air rate: .82 lbs min


Box Balance 18" Hg - 3" Hg
(Note all 2 BBL carbs are tested at 3" of mercury (TV)

Remarks: (1*) 7015108 pump act. Shaft & outside lever assy, 7007506 choke lever & link assy,
7002075 link

7021008 air horn gasket idle vent adj: bend pump lever tang to just open valve
with .020 +/- .005 plug bet thr. Vlv. & bore side opposite idle needle.
(2*) 7006079 needle seat screen
(3*) 7019477 baffle in hsg. .063 dia hole in baffle.
(4*) Choke should just close at 75 degrees F when set on Index.
(5*) 7000291 defusser in nozzle.
(6*) (2) 7017918 .109 dia. Idle channel inserts .153 length pressed in flush +/- .002
(7*) Bottom Slot .032 +/- .004 below top of shaft
Note: 7029693 vac switch assy Adj to obtain 1.100 +/- .010 bet top of bosses on movable lever & top of
switch at W.O.T.

date 9-24-1964 SAE 1-1/4" Spec 1
Customer 1965 2GC Pont. Pow. Pak. 421 Engine (center) A/T
7025169 Pow. Pak Assy 7025070 - Center 7024078 - Front 7024079 rear
Model 7025070 Similar to 7025074

This sheet has a lot of changes and is more like the 1st 1965 389 sheet I posted
So the production order would be 2nd sheet, then 1st sheet, and now this sheet.


Tom V.

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  #74  
Old 03-18-2020, 03:04 PM
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Quote:
Originally Posted by Tom Vaught View Post
7026074 Carb, Kenth look at the top of the sheets, the first few lines of info.
Each specific carb number is listed there vs looking at the bottom of the page
which is confusing in its statements at times.

Tom V.
Tom V, i have found 7026074 389/421 A/T center carb uses #60 main jets and .055" drilled hole i throttle valves.
The specs in your post on the 7026074 correlates more to the 7026075 389/421 M/T center carb which uses #62 main jets an no holes in the throttle blades?

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  #75  
Old 03-18-2020, 03:17 PM
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PM sent

  #76  
Old 03-18-2020, 04:00 PM
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Quote:
Originally Posted by Kenth View Post
Tom V, i have found 7026074 389/421 A/T center carb uses #60 main jets and .055" drilled hole i throttle valves.
The specs in your post on the 7026074 correlates more to the 7026075 389/421 M/T center carb which uses #62 main jets an no holes in the throttle blades?
I am just typing the information (to the best of my limited typing skills) presently. I would suggest to the PY Members that they make no copies of the information until I have loaded ALL of the information and checked line by line for errors BEFORE they copied and printed the information for their files.

Errors on this large amount of information CAN happen during the initial phase.

Patience and we will have accurate information.

Thanks Kenth for identifying the errors identified in my typing to date.

Tom Vaught

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  #77  
Old 03-19-2020, 12:03 PM
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Taking a long week-end so see you on Tuesday as far as new info on the Tri-Power post.

I might communicate/view occasionally, on my phone, but no capability to do the large spreadsheets for the Tri-Power carbs Information.

It will be a few days before new info.

Tom V.

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Old 03-25-2020, 08:55 AM
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Doing errands for people in the neighborhood, Tri-Power stuff is far down on the list.
Will try to do more on it down the road after this Virus mess in worked out for the people in the community.

Tom V.

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  #79  
Old 03-25-2020, 09:00 PM
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Maybe by Saturday Morning I can get back on the carb sheets. Be Safe out there.
Tom V.

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  #80  
Old 03-28-2020, 03:12 PM
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Back at it as promised.

I HAVE CONFIRMED that the information for Pontiac Tri-Power FRONT CARB 7024178 is
correct (as previously posted) in Posts # 32 and # 33 of this information.

Tom Vaught

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