Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1985PICKUP C20, 2D PICKUP, 4.8 TREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMCARBURETOR - ROCHESTER E4ME & E4MED 4-BBLSPECIFICATIONS
1985 Chevrolet Pickup C20, 2D Pickup, 4.8 T
Carburetor - ROCHESTER E4ME & E4MED 4-Bbl: Specifications
1985 Chevrolet Pickup C20, 2D Pickup, 4.8 TSECTION Specifications
CARBURETOR ADJUSTMENT SPECIFICATIONS
| Application (Carb. No.) | Specification | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| 17085210 | |||||||||
| Float Level | 13/32" | ||||||||
| Air Valve Spring | 7/8 | ||||||||
| Pump Rod Setting | Inner 9/32" | ||||||||
| Choke Coil Lever | .120" | ||||||||
| Choke Rod | 20° | ||||||||
| Vacuum Break | |||||||||
| Primary | 26° | ||||||||
| Secondary | 36° | ||||||||
| Air Valve Rod | .025" | ||||||||
| Choke Unloader | 39° | ||||||||
| Secondary Lockout | .015" | ||||||||
| 17085502 | |||||||||
| Float Level | 7/16" | ||||||||
| Accelerator Pump | (2) TR | ||||||||
| Idle Air Bleed | (3) | ||||||||
| Air Valve Spring (1) | 7/8 | ||||||||
| Choke Coil Lever | .120" | ||||||||
| Choke Rod | 20° | ||||||||
| Vacuum Break | |||||||||
| Primary | 26° | ||||||||
| Secondary | 36° | ||||||||
| Air Valve Rod | .025" | ||||||||
| Auto. Choke | (2) TR | ||||||||
| Choke Unloader | 39° | ||||||||
| Secondary Lockout | .015" | ||||||||
| 17085503 | |||||||||
| Float Level | 7/16" | ||||||||
| Accelerator Pump | (2) TR | ||||||||
| Idle Air Bleed | (3) | ||||||||
| Air Valve Spring (1) | 7/8 | ||||||||
| Choke Coil Lever | .120" | ||||||||
| Choke Rod | 20° | ||||||||
| Vacuum Break | |||||||||
| Primary | 26° | ||||||||
| Secondary | 36° | ||||||||
| Air Valve Rod | .025" | ||||||||
| Auto. Choke | (2) TR | ||||||||
| Choke Unloader | 39° | ||||||||
| Secondary Lockout | .015" | ||||||||
| 17085506 | |||||||||
| Float Level | 7/16" | ||||||||
| Accelerator Pump | (2) TR | ||||||||
| Idle Air Bleed | (3) | ||||||||
| Air Valve Spring (1) | 1 | ||||||||
| Choke Coil Lever | .120" | ||||||||
| Choke Rod | 20° | ||||||||
| Vacuum Break | |||||||||
| Primary | 27° | ||||||||
| Secondary | 36° | ||||||||
| Air Valve Rod | .025" | ||||||||
| Auto. Choke | (2) TR | ||||||||
| Choke Unloader | 36° | ||||||||
| Secondary Lockout | .015" | ||||||||
| 17085508 | |||||||||
| Float Level | 7/16" | ||||||||
| Accelerator Pump | (2) TR | ||||||||
| Idle Air Bleed | (3) | ||||||||
| Air Valve Spring (1) | 1 | ||||||||
| Choke Coil Lever | .120" | ||||||||
| Choke Rod | 20° | ||||||||
| Vacuum Break | |||||||||
| Primary | 27° | ||||||||
| Secondary | 36° | ||||||||
| Air Valve Rod | .025" | ||||||||
| Auto. Choke | (2) TR | ||||||||
| Choke Unloader | 36° | ||||||||
| Secondary Lockout | .015" | ||||||||
| 17085524 | |||||||||
| Float Level | 7/16" | ||||||||
| Accelerator Pump | (2) TR | ||||||||
| Idle Air Bleed | (3) | ||||||||
| Air Valve Spring (1) | 1 | ||||||||
| Choke Coil Lever | .120" | ||||||||
| Choke Rod | 20° | ||||||||
| Vacuum Break | |||||||||
| Primary | 25° | ||||||||
| Secondary | 36° | ||||||||
| Air Valve Rod | .025" | ||||||||
| Auto. Choke | (2) TR | ||||||||
| Choke Unloader | 36° | ||||||||
| Secondary Lockout | .015" | ||||||||
| 17085526 | |||||||||
| Float Level | 7/16" | ||||||||
| Accelerator Pump | (2) TR | ||||||||
| Idle Air Bleed | (3) | ||||||||
| Air Valve Spring (1) | 1 | ||||||||
| Choke Coil Lever | .120" | ||||||||
| Choke Rod | 20° | ||||||||
| Vacuum Break | |||||||||
| Primary | 25° | ||||||||
| Secondary | 36° | ||||||||
| Air Valve Rod | .025" | ||||||||
| Auto. Choke | (2) TR | ||||||||
| Choke Unloader | 36° | ||||||||
| Secondary Lockout | .015" | ||||||||
|
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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.