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HOMESERVICE MANUALSCHEVROLET1966BISCAYNE 5.3L ENG, STANDARD TRANS, TRANS MFR CD T-10DREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEFUEL DELIVERYROCHESTER 4 MC & 4MV 4-BARRELDESCRIPTIONOLDSMOBILE "CLIMATIC COMBUSTION CONTROL"

1966 Chevrolet Biscayne 5.3L Eng, Standard Trans, Trans Mfr CD T-10D

Oldsmobile "Climatic Combustion Control"

1966 Chevrolet Biscayne 5.3L Eng, Standard Trans, Trans Mfr CD T-10DSECTION Oldsmobile "Climatic Combustion Control"

This device consists of a thermostatically controlled heated air inlet in the air cleaner (heated air drawn from stove on right hand exhaust pipe) which provides carburetor air temperature of 100°F when underhood temperature is less than 100°F.

Fig 1: 4MV IDLE AIR BLEED LOCATIONS

Courtesy of GENERAL MOTORS COMPANY

1965-66 CARBURETOR ADJUSTMENT SPECIFICATIONS (Table No. 1)

Rochester Carb. No.

Slow Idle Speed (Engine RPM)⁽¹⁾

Fast Idle Speed (Eng. RPM)

Float Level Setting

Pump Rod Setting

Idle Vent Setting

Air Valve Setting

Synchro-mesh

Auto. Trans.

7025200

..........

⁽²⁾

2000⁽⁷⁾

3/16"

9/32" ⁽⁸⁾

13/32"

1 1/16"

7025201

450-550

..........

2000⁽⁷⁾

3/16"

9/32" ⁽⁸⁾

13/32"

1 1/16"

7025220

..........

⁽²⁾

2000⁽⁷⁾

3/16"

9/32" ⁽⁸⁾

13/32"

1 1/16"

7025221

450-500

..........

2000⁽⁷⁾

3/16"

9/32" ⁽⁸⁾

13/32"

1 1/16"

7026200

..........

450-500 ⁽²⁾

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7026201

450-500

..........

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7026202

..........

450-500 ⁽²⁾

2200⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7026203

450-500

..........

2200⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7026204

..........

500-600 ⁽²⁾

2000⁽⁷⁾

1/4"

9/32"⁽⁸⁾

3/8"

1 1/4"

7026205

500-600

..........

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7026206

..........

500-600 ⁽⁴⁾

2000⁽⁶⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7026207

500-600

..........

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7026240

..........

500⁽⁴⁾

600 ⁽⁶⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 3/16"

7026242

..........

500⁽⁴⁾

600 ⁽⁶⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 3/16"

7026250

⁽⁹⁾

⁽¹⁰⁾

700 ⁽⁶⁾

11/32"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7026254

600⁽³⁾

500⁽⁵⁾

700 ⁽⁶⁾

1 1/32"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7026255

..........

550

700⁽⁶⁾

11/32"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7026256

..........

550

700⁽⁶⁾

11/32"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7026260

..........

500⁽³⁾

..........

7/32"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7026261

600⁽³⁾

..........

7/32"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7036200

..........

450-500 ⁽²⁾

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7036201

450-550

..........

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7036202

..........

600⁽³⁾

2200⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7036203

700⁽³⁾

..........

2200⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7036204

..........

550

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7036205

600

..........

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7036206

..........

550

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7036207

550

..........

2000⁽⁷⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 1/4"

7036240

..........

550⁽³⁾

600⁽⁶⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 3/16"

7036242

..........

550⁽³⁾

600⁽⁶⁾

1/4"

9/32" ⁽⁸⁾

3/8"

1 3/16"

7036250

⁽⁹⁾

⁽¹⁰⁾

700⁽⁶⁾

11/32"

9/32" ⁽⁸⁾

3/8"

1 1/8"

7036254

600⁽³⁾

700⁽⁶⁾

11/32"

9/32" ⁽⁸⁾

3/8"

1 1/8"

⁽¹⁾	Auto. Trans. in Drive. Air. Conditioner ON (Except as noted).

⁽²⁾	Set as low as possible for smooth idling in Drive to prevent creep and harsh shifts in service.

⁽³⁾	Air Conditioner OFF.

⁽⁴⁾	550 RPM on Air Cond. cars (Air Cond. OFF).

⁽⁵⁾	575 RPM on Air Cond. cars (Air Cond. OFF).

⁽⁶⁾	Cam follower on LOW step of fast idle cam.

⁽⁷⁾	Cam follower on HIGH step of fast idle cam.

⁽⁸⁾	Pump rod in INNER hole of pump lever.

⁽⁹⁾	600 RPM (400" Eng.), 550 RPM (425" Eng.) Air Conditioner OFF.

⁽¹⁰⁾	600 RPM (400" Eng.), 500 RPM (425" Eng. without Air Cond.), 575 RPM (425" Eng. with Air Cond.). Air Conditioner OFF.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.

Safety Warning

Oldsmobile &quot;Climatic Combustion Control&quot;

Use the Manual With the Right Hardware

When to See a Mechanic

Oldsmobile "Climatic Combustion Control"