[Tom Vaught]

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.