Choke Unloader

Open throttle valve wide open. Apply light closing pressure to choke valve. Measure specified clearance between upper edge of choke valve and air horn wall. See Fig 1 .

Measurement can be made with a specified drill or pin gauge. To adjust, bend choke unloader tang.

Fig 1: Adjusting Choke Unloader

Courtesy of GENERAL MOTORS COMPANY

Fig 2: Exploded View of 1975-78 2GC Carburetor

Courtesy of GENERAL MOTORS COMPANY

Fig 3: Exploded View of 1977-78 2GE Carburetor

Courtesy of GENERAL MOTORS COMPANY

1975 CARBURETOR ADJUSTMENT SPECIFICATIONS

Rochester Carb. No.⁽³⁾

Idle Speed (Engine RPM)

Float Setting

Pump Rod Setting

Intermediate Choke Rod

Choke Rod (Fast Idle Cam)

Aux. Vac. Break

Break Setting

Unloader Setting

Choke Setting

Hot

Fast

Buick

5147

600/800

⁽⁴⁾

⁽¹⁾13/32"

1 3/4"

.120"

.080"

.120"

.140"

1 NR

5147

600/800

⁽⁴⁾

⁽¹⁾13/32"

1 3/4"

.120"

.080"

.120"

.140"

Index

5148

500/700

⁽⁴⁾

⁽¹⁾13/32"

1 3/4"

.120"

.080"

.120"

.140"

1 NR

5149

500/650

⁽⁴⁾

⁽¹⁾13/32"

1 3/4"

.120"

.080"

.120"

.140"

1 NR

5448

500/700

⁽⁴⁾

⁽¹⁾13/32"

1 3/4"

.120"

.080"

.120"

.140"

Index

5449

500/700

⁽⁴⁾

⁽¹⁾13/32"

1 3/4"

.120"

.080"

.120"

.140"

1 NR

5143

600

⁽⁴⁾

⁽¹⁾15/32"

1 3/4"

.120"

.080"

.120"

.180"

1 NR

5140

600

⁽⁴⁾

⁽¹⁾15/32"

1 3/4"

.120"

.080"

.120"

.180"

1 NR

Chevrolet

5105

⁽⁴⁾

⁽²⁾19/32"

1 19/32"

.120"

.375"

.....

.130"

.350"

5106

⁽⁴⁾

⁽²⁾19/32"

1 19/32"

.120"

.380"

.....

.130"

.350"

5111

⁽⁴⁾

⁽²⁾19/32"

1 5/8"

.120"

.400"

.....

.130"

.350"

5112

⁽⁴⁾

⁽²⁾19/32"

1 5/8"

.120"

.400"

.....

.130"

.350"

5114

⁽⁴⁾

⁽²⁾19/32"

1 5/8"

.120"

.400"

.....

.130"

.350"

5115

⁽⁴⁾

⁽²⁾19/32"

1 5/8"

.120"

.400"

.....

.130"

.350"

5123

⁽⁴⁾

⁽²⁾19/32"

1 5/8"

.120"

.400"

.....

.130"

.350"

5124

⁽⁴⁾

⁽²⁾19/32"

1 5/8"

.120"

.400"

.....

.130"

.350"

5404

⁽⁴⁾

⁽²⁾19/32"

1 19/32"

.120"

.380"

.....

.130"

.350"

5406

⁽⁴⁾

⁽²⁾19/32"

1 19/32"

.120"

.380"

.....

.130"

.350"

Oldsmobile

5160

⁽⁴⁾

⁽²⁾9/16"

1 11/32"

.120"

.085"

.265"

.145"

.180"

1 NR

5161

⁽⁴⁾

1800

⁽²⁾9/16"

1 11/32"

.120"

.085"

.265"

.145"

.180"

1 NR

5143

⁽⁴⁾

1800

1 15/32"

1 19/32"

.120"

.080"

.120"

.140"

.180"

1 NR

5147

650

1800

⁽¹⁾7/16"

1 19/32"

.120"

.080"

.120"

.140"

1 L

5149

800

1800

⁽¹⁾7/16"

1 19/32"

.120"

.080"

.120"

.140"

1 NR

5449

800

1800

⁽¹⁾7/16"

1 19/32"

.120"

.080"

.120"

.140"

1 L

Pontiac

5160

600

⁽⁴⁾

⁽²⁾9/16"

1 3/4"

.....

.085"

.265"

.145"

.180"

1 NR

5162

600

⁽⁴⁾

⁽²⁾9/16"

1 3/4"

.....

.085"

.260"

.145"

.180"

1 NR

5171

600

⁽⁴⁾

⁽²⁾9/16"

1 3/4"

.....

.085"

.260"

.145"

.180"

1 NR

5143

600

⁽⁴⁾

⁽²⁾15/32"

1 3/4"

.....

.080"

.120"

.140"

.180"

1 NR

Vega

5101, 5105

.....

⁽²⁾19/32"

1 19/32"

.....

.375"

.....

.130"

.350"

5401, 5405

.....

⁽²⁾21/32"

1 19/32"

.....

.380"

.....

.130"

.350"

5102, 5106

.....

⁽²⁾19/32"

1 19/32"

.....

.375"

.....

.130"

.350"

5406,

.....

⁽²⁾21/32"

1 19/32"

.....

.380"

.....

.130"

.350"

⁽¹⁾	Float Drop Setting is 1 19/32"

⁽²⁾	Float Drop Setting is 1 7/32"

⁽³⁾	Prefix number is 704.

⁽⁴⁾	Refer to Emission Control Tune-Up Decal in Engine Compartment.

1976 CARBURETOR ADJUSTMENT SPECIFICATIONS

Rochester Carb. No. ⁽¹⁾

Idle Speed (Engine RPM)

Float Setting

Pump Rod Setting

Intermediate Choke Rod

Choke Rod (Fast Idle Cam)

Aux. Vac. Break

Break Setting

Unloader Setting

Choke Setting

Hot

Fast

BUICK

6140

600

1800

⁽³⁾15/32"

1 11/32"

.120"

.080"

.100"

.140"

.180"

1NR

6143

600

1800

⁽³⁾15/32"

1 11/32"

.120"

.080"

.100"

.140"

.180"

1NR

6145

600

⁽⁶⁾600/800⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.140"

1NR

6146

600

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.180"

1NR

6148

600

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.180"

1NR

6149

600

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.180"

1NR

6446

600

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.180"

1NR

6447

600

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.180"

1NR

6448

600

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.180"

1NR

6449

600

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.180"

1NR

CHEVROLET

6101

⁽²⁾

⁽⁴⁾17/32"

1 21/32"

.....

.260"

.....

.130"

.325"

INDEX

6102

⁽²⁾

⁽⁴⁾17/32"

1 21/32"

.....

.260"

.....

.130"

.325"

INDEX

6103

⁽²⁾

⁽⁴⁾17/32"

1 21/32"

.....

.260"

.....

.130"

.325"

INDEX

6108

600

⁽²⁾

⁽⁴⁾9/16"

1 21/32

.....

.260"

.....

.140"

.325"

INDEX

6110

600

⁽²⁾

⁽⁴⁾9/16"

1 21/32

.....

.260"

.....

.140"

.325"

INDEX

6111

800

⁽²⁾

⁽⁴⁾9/16"

1 11/16"

.....

.260"

.....

.130"

.325"

INDEX

6112

600

⁽²⁾

⁽⁴⁾9/16"

1 21/32"

.....

.260"

.....

.140"

.325"

INDEX

6113

800

⁽²⁾

⁽⁴⁾9/16"

1 11/16

.....

.260"

.....

.130"

.325"

INDEX

6114

600

⁽²⁾

⁽⁴⁾21/32"

1 11/16"

.....

.260"

.....

.130"

.325"

INDEX

6104

⁽²⁾

⁽⁴⁾17/32"

1 21/32"

.....

.260"

.....

.140"

.325"

INDEX

6105

⁽²⁾

⁽⁴⁾17/32"

1 21/32"

.....

.260"

.....

.140"

.325"

INDEX

6404

⁽²⁾

⁽⁴⁾17/32"

1 21/32"

.....

.260"

.....

.140"

.325"

INDEX

6405

⁽²⁾

⁽⁴⁾17/32"

1 21/32"

.....

.260"

.....

.140"

.325"

INDEX

6430

600

1600

⁽⁴⁾9/16"

1 11/16"

.....

.120"

.....

.140"

.325"

INDEX

6432

600

1600

⁽⁴⁾9/16"

1 11/16"

.....

.120"

.....

.140"

.325"

INDEX

OLDSMOBILE

6143

600

⁽⁷⁾

⁽³⁾15/32"

1 11/32"

.120"

.080"

.100"

.140"

.180"

1NR

6145

⁽⁶⁾600/800

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.110"

.140"

1NR

6149

⁽⁶⁾600/800

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.140"

1NR

6447

⁽⁶⁾600/800

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.110"

.130"

.140"

1NR

6449

⁽⁶⁾600/800

⁽⁷⁾

⁽³⁾7/16"

1 19/32"

.120"

.080"

.110"

.130"

.140"

1NR

PONTIAC

6140

600

⁽²⁾

⁽⁴⁾15/32"

1 11/32"

.120"

.080"

.100"

.140"

.180"

1NR

6145

800

⁽²⁾

⁽⁴⁾7/16"

1 19/32"

.120"

.080"

100"

.110"

.140"

1NR

6149

600

⁽²⁾

⁽⁴⁾7/16"

1 19/32"

.120"

.080"

.100"

.120"

.140"

1NR

6160

550

⁽²⁾

⁽⁴⁾9/16"

1 11/32"

.120"

.085"

.285"

⁽⁸⁾.145"

.180"

1NR

6161

550

⁽²⁾

⁽⁴⁾9/16"

1 11/32"

.120"

.085"

.285"

⁽⁸⁾.145"

.180"

1NR

6162

550

⁽²⁾

⁽⁴⁾9/16"

1 11/32"

.120"

.085"

.285"

⁽⁸⁾.145"

.180"

1NR

6447

800

⁽²⁾

⁽⁴⁾7/16"

1 19/32"

.120"

.080"

.110"

.130"

.140"

1NR

6449

600

⁽²⁾

⁽⁴⁾7/16"

1 19/32"

.120"

.080"

.110"

.130"

.140"

1NR

⁽¹⁾	Basic number is 1705.

⁽²⁾	Refer to Exhaust Emission Tune-Up Label.

⁽³⁾	Float Drop: 1 5/32".

⁽⁴⁾	Float Drop: 1 9/32".

⁽⁵⁾	Float Drop: 31/32".

⁽⁶⁾	Solenoid De-energized/Solenoid Energized.

⁽⁷⁾	Fast idle is automatically set when hot (slow) idle is set.

⁽⁸⁾	Setting given is for engine codes XH, XN, XK, XL; all others use 0.165".

1977 CARBURETOR ADJUSTMENT SPECIFICATIONS

Rochester Carb. No.⁽¹⁾

Idle Speed (Engine RPM)

Float Setting

Pump Rod Location

Choke Rod

Air Valve Dashpot

Aux. Vac.

Break Setting

Air Valve Windup

Choke Setting

Hot

Fast

Buick

7108

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.130"

140"

.325"

INDEX

7110

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

140"

.325"

INDEX

7140

600

⁽²⁾

19/32"⁽³⁾

1 9/16"

.120"

.080"

.100" 140"

.325"

1NR

7141

⁽²⁾

7/16"⁽⁴⁾

1 1/2

.120"

.080"

.040"

110"

.140"

1NR

7143

⁽²⁾

7/16"⁽⁴⁾

1 17/32"

.120"

.080"

.100"

130"

.140"

1NR

7144

⁽²⁾

7/16"⁽⁴⁾

1 17/32"

.120"

.080"

.100"

130"

.140"

1NR

7145

⁽²⁾

7/16"⁽⁴⁾

1 1/2

.120"

.080"

.040"

110"

.140"

1NR

7146

⁽²⁾

7/16"⁽⁴⁾

1 17/32"

.....

.040"

110"

.....

7147

⁽²⁾

7/16"⁽⁴⁾

1 1/2"

.120"

.080"

.040"

110"

.140"

1NR

7148

⁽²⁾

7/16"⁽⁴⁾

1 1/2"

.120"

.080"

.040"

110"

.140"

1NR

7445

⁽²⁾

7/16"⁽⁴⁾

1 1/2"

.120"

.080"

.110"

140"

.140"

1NR

7446

⁽²⁾

7/16"⁽⁴⁾

1 1/2"

.120"

.080"

.110"

130"

.140"

1NR

7447

⁽²⁾

7/16"⁽⁴⁾

1 1/2"

.120"

.080"

.100"

130"

.140"

1NR

Chevrolet

7108

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

INDEX

7110

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

INDEX

7111

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

INDEX

7112

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

INDEX

7113

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

INDEX

7114

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

INDEX

7121

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

INDEX

7123

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

INDEX

7408

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

1/2 NL

7410

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

1/2 NL

7412

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

1/2 NL

7414

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.160"

.....

.325"

1/2 NL

Pontiac

7108

⁽²⁾

5/8"⁽⁵⁾

1 5/8"

.120"

.260"

.....

130"

.325"

INDEX

7110

⁽²⁾

5/8"⁽⁵⁾

1 5/8"

.120"

.260"

.....

130"

.325"

INDEX

7143

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.080"

.100"

.130"

.140"

1NL

7144

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.080"

.100"

.130"

.140"

1NL

7145

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.080"

.040"

.110"

.140"

1NL

7146

⁽²⁾

7/16"⁽⁴⁾

1 9/16"

.....

.040"

.110"

.....

7148

⁽²⁾

7/16"⁽⁴⁾

1 9/16"

.120"

.080"

.030"

.110"

.140"

1NL

7445

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.080"

.110"

.130"

.140"

1NL

7446

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.080"

.110"

.130"

.140"

1NL

7447

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.080"

.110"

.130"

.140"

1NL

7448

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.080"

.110"

.130"

.140"

1NL

Oldsmobile

7104

⁽²⁾

7/16"⁽³⁾

1 21/32"

.120"

.260"

.130"

.....

.325"

INDEX

7105

⁽²⁾

7/16"⁽³⁾

1 21/32"

.120"

.260"

.130"

.....

.325"

INDEX

7107

⁽²⁾

7/16"⁽³⁾

1 5/8"

.120"

.260"

.130"

.....

.325"

INDEX

7108

⁽²⁾

7/16"⁽³⁾

1 5/8"

.120"

.260"

.130"

.....

.325"

INDEX

7109

⁽²⁾

7/16"⁽³⁾

1 5/8"

.120"

.260"

.130"

.....

.325"

INDEX

7110

⁽²⁾

7/16"⁽³⁾

1 5/8"

.120"

.260"

.130"

.....

.325"

INDEX

7112

⁽²⁾

19/32"⁽³⁾

1 5/8"

.120"

.260"

.130"

.....

.325"

INDEX

7113

⁽²⁾

19/32"⁽³⁾

1 5/8"

.120"

.260"

.130"

.....

.325"

INDEX

7114

⁽²⁾

19/32"⁽³⁾

1 21/32"

.120"

.260"

.130"

.....

.325"

INDEX

7123

⁽²⁾

19/32"⁽³⁾

1 5/8"

.120"

.260"

.130"

.....

.325"

INDEX

7143

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.260"

.100"

.130"

.140"

1NR

7144

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.260"

.100"

.130"

.140"

1NR

7145

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.260"

.090"

.110"

.140"

1NR

7146

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.260"

.090"

.110"

.140"

1NR

7148

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.260"

.090"

.110"

.140"

1NR

7404

⁽²⁾

1/2"⁽⁴⁾

1 21/32"

.120"

.260"

.140"

.....

.325"

1NL

7405

⁽²⁾

1/2"⁽⁴⁾

1 5/8"

.120"

.260"

.140"

.....

.325"

1NL

7445

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.260"

.140"

1NL

7446

⁽²⁾

7/16"⁽⁴⁾

1 19/32"

.120"

.260"

.110"

.130"

.140"

1NR

7447

⁽²⁾

7/16"⁽³⁾

1 19/32"

.120"

.260"

.100"

.130"

.140"

1NR

7448

⁽²⁾

7/16"⁽³⁾

1 19/32"

.120"

.260"

.110"

.130"

.140"

1NR

⁽¹⁾	Carburetor number prefix is 1705.

⁽²⁾	See Emission Control Tune-Up Decal.

⁽³⁾	Float drop is 1 9/32".

⁽⁴⁾	Float drop is 1 5/32".

⁽⁵⁾	Float drop is 1 1/4".

1978 CARBURETOR ADJUSTMENT SPECIFICATIONS

Rochester Carb. No.

Idle Speed (Engine RPM)

Float Level

Float Drop

Acc. Pomp Rod

Auto. Choke Setting

Choke Rod. (Cam)

Vacuum Break (Throttle)

Vacuum Break (Choke)

Choke Unloader

Hot

Fast

Buick

2GC

17058104

⁽¹⁾

15/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058105

⁽¹⁾

15/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058108

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058110

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058112

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058114

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058126

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽³⁾

.325"

17058128

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽³⁾

.325"

17058404

⁽¹⁾

1/2"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"⁽²⁾

.325"

17058405

⁽¹⁾

1/2"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"⁽²⁾

.325"

17058408

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"⁽²⁾

.325"

17058410

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"⁽²⁾

.325"

17058412

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"⁽²⁾

.325"

17058414

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"⁽²⁾

.325"

2GE

17058140

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.070"

.140"

17058141

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.140"

.100"

.140"

17058143

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058144

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.110"

.060"

.140"

17058145

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.060"

.160"

17058147

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.140"

.100"

.140"

17058148

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.150"

17058149

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.150"

17058182

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058183

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058185

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.050"

.140"

17058187

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.050"

.140"

17058188

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.120"

.050"

.140"

17058189

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058444

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.140"

.100"

.140"

17058446

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.130"

.110"

.140"

17058447

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.150"

.110"

.140"

17058448

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.140"

.100"

.140"

Chevrolet

2GC

17058102

⁽¹⁾

15/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"⁽³⁾

.325"

17058103

⁽¹⁾

15/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"⁽³⁾

.325"

17058104

⁽¹⁾

15/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058105

⁽¹⁾

15/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058107

⁽¹⁾

15/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058109

⁽¹⁾

15/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"⁽²⁾

.325"

17058404

⁽¹⁾

1/2"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"⁽²⁾

.325"

17058405

⁽¹⁾

1/2"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"⁽²⁾

.325"

2GE

17058143

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.110"

.040"

.140"

17058144

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.110"

.060"

.140"

17058147

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.140"

.100"

.140"

17058447

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.150"

.110"

.140"

Oldsmobile

2GC

17058102

⁽¹⁾

15/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058103

⁽¹⁾

15/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058104

⁽¹⁾

15/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"

.325"

17058105

⁽¹⁾

15/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"

.325"

17058107

⁽¹⁾

15/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058108

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"

.325"

17058109

⁽¹⁾

15/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058110

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"

.325"

17058111

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058113

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058121

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058123

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058126

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058128

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058404

⁽¹⁾

1/2"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"

.325"

17058405

⁽¹⁾

1/2"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"

.325"

17058408

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"

.325"

17058410

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"

.325"

2GE

17058140

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.070"

.140"

17058145

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.060"

.160"

17058147

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.140"

.100"

.140"

17058182

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058183

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058185

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.050"

.140"

17058187

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058189

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058444

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.140"

.100"

.140"

17058446

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.130"

.110"

.140"

17058447

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.150"

.110"

.140"

17058448

⁽¹⁾

7/16"

1 5/32"

1 9/16"

1 NR

.080"

.140"

.100"

.140"

Pontiac

2GC

17058102

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058103

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058108

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"

.325"

17058110

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"

.325"

17058111

⁽¹⁾

19/32"

1 9/32"

1 5/8"

INDEX

.260"

.....

.130"

.325"

17058112

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"

.325"

17058113

⁽¹⁾

19/32"

1 9/32"

1 5/8"

INDEX

.260"

.....

.130"

.325"

17058114

⁽¹⁾

19/32"

1 9/32"

1 21/32"

INDEX

.260"

.....

.130"

.325"

17058121

⁽¹⁾

19/32"

1 9/32"

1 5/8"

INDEX

.260"

.....

.130"

.325"

17058123

⁽¹⁾

19/32"

1 9/32"

1 5/8"

INDEX

.260"

.....

.130"

.325"

17058126

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058128

⁽¹⁾

19/32"

1 9/32"

1 17/32"

INDEX

.260"

.....

.130"

.325"

17058408

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"

.325"

17058410

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"

.325"

17058412

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"

.325"

17058414

⁽¹⁾

21/32"

1 9/32"

1 21/32"

1/2 NL

.260"

.....

.140"

.325"

2GE

17058145

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NL

.080"

.110"

.060"

.160"

17058147

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.140"

.100"

.140"

17058185

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.050"

.140"

17058187

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058189

⁽¹⁾

7/16"

1 5/32"

1 19/32"

1 NR

.080"

.110"

.080"

.140"

17058444

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.140"

.100"

.140"

17058446

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.140"

.110"

.140"

17058447

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.150"

.110"

.140"

17058448

⁽¹⁾

7/16"

1 5/32"

1 5/8"

1 NR

.080"

.140"

.110"

.140"

NOTE: Choke coil lever adjustment on all 2GC and 2GE Rochester models is 0.120".

⁽¹⁾	See Emission Control Tune-Up Decal.

⁽²⁾	Reset to 0.160" at FIRST Tune-Up.

⁽³⁾	Reset to 0.150" at FIRST Tune-Up.