Serial Numbers
1Z37L6S400001 - 1Z37L6S446558
The fifth character represents the engine type
L is for the base L48 engine
X is for the optional L82 engine
Drivetrain
| Engine Type |
Compression Ratio |
Net Horsepower |
Net |
Transmission | Standard Axle |
Highway Axle |
High-Altitude/ Performance Axle |
| L48 | 8.5:1 | 180 | 270 | 4-speed manual Wide Ratio(2.64:1 low) |
3.36:1 | 3.08:1 | - |
| L48 | 8.5:1 | 180 | 270 | Turbo Hydra-Matic 350 | 3.08:1 | - | - |
| L82* | 9.0:1 | 210 | 255 | 4-speed manual Wide Ratio(2.64:1 low) |
3.55:1 | - | - |
| L82* | 9.0:1 | 210 | 255 | 4-speed manual Close Ratio(2.43:1 low) |
3.55:1 | - | 3.70:1 |
| L82* | 9.0:1 | 210 | 255 | Turbo Hydra-Matic 400 | 3.36:1 | - | 3.55:1 |
Engine Codes
| Engine Code |
R.P.O. | Cubic Inches |
Horsepower | Applicable Equipment |
| CKW | L48 | 350 | 180 | 4-speed (Federal) |
| CKX | L48 | 350 | 180 | Turbo Hydra-Matic 350 (Federal) |
| CLS | L48 | 350 | 180 | Turbo Hydra-Matic 350 (California) |
| CHC | L82 | 350 | 210 | 4-speed (Federal) |
| CKC | L82 | 350 | 210 | Turbo Hydra-Matic 400 (Federal) |
| CLM | - | 350 | - | Unverified |
| CLR | - | 350 | - | Unverified |
Axle Ratio and Code
| Code | Ratio |
| OA | 3.08:1 |
| OD | 3.36:1 |
| LR | 3.36:1 |
| OB | 3.55:1 |
| OC | 3.70:1 |
Transmission Identification Codes
| Transmission | Code |
| Warner 4-speed, Heavy Duty Aluminum Case | W |
| Turbo Hydra-Matic 350 | AM, XH |
| Turbo Hydra-Matic 400 | CZ |
Engine Block Casting Numbers
| 3970010 | All Applications |
Cylinder Head Casting Numbers
| 333882 | All Applications |
Intake Manifold Casting Numbers
| 346249 | All Applications |
Exhaust Manifold Casting Numbers
| 3932461 | All Applications |
Carburetor Numbers
| Engine | Transmission | Manufacturer | Model | Chevrolet # |
| L48 | Turbo Hydra-Matic | Rochester | M4MC | 17056206 |
| L48 | 4-speed | Rochester | M4MC | 17056207 |
| L48 (California) | Turbo Hydra-Matic | Rochester | M4MC | 17056506 |
| L48 (California) | 4-speed | Rochester | M4MC | 17056507 |
| L82 | Turbo Hydra-Matic | Rochester | M4MC | 17056210 |
| L82 | 4-speed | Rochester | M4MC | 17056211 |
| L82 with A/C | Turbo Hydra-Matic | Rochester | M4MC | 17056226 |
Distributor Numbers
| Distributor # | Application |
| 1112888 | L48 |
| 1112905 | L48 (California) |
| 1103200 | L82 with 4-speed |
| 1112979 | L82 with Turbo Hydra-Matic |
Alternator Numbers
| Alternator # | Amp Rating | Application |
| 1102474 | 61 | With A/C |
| 1102484 | 42 | Standard |
Starter Numbers
| Starter # | Application |
| 1108775 | 4-speed |
| 1108776 | Turbo Hydra-Matic |
Wiper Motor Numbers
| 5044814 | All Applications |
Horn Numbers
| Low Note | High Note | Relay |
| 9000144 | 9000143 | 344813 |