Engine can be identified by the 8th character of Vehicle Identification Number (VIN). The VIN is located on top left corner of instrument panel, and is visible through windshield.
| Application | Code |
|---|---|
| 4.5L (273") Digital Fuel Injection (DFI) | 5 |
| 5.0L (305") Throttle Body Injection (TBI) | E |
| 5.0L (305") Tuned Port Injection (TPI) | F |
| 5.0L (307") 4-Bbl. | Y |
| 5.7L (350") Throttle Body Injection (TBI) Police Models | 7 |
| 5.7L (350") Tuned Port Injection (TPI) | 8 |
VIN ENGINE CODES
| Body Designation | Model |
|---|---|
| B | Caprice, Custom Cruiser Electra Estate Wagon, LeSabre Estate Wagon, Safari Wagon |
| C | Deville, Electra, Fleetwood, Ninety-Eight |
| D | Brougham |
| E | Eldorado |
| F | Camaro, Firebird |
| K | Seville |
| Y | Corvette |
MODEL & BODY IDENTIFICATION
Note. When performing tune-up procedures described in this article, the following notes and precautions must be followed.
Always refer to Engine Tune-Up Decal in engine compartment before performing tune-up. If manual and decal differ, use decal specifications.
With the exception of initial ignition timing, normal tune-up procedures are not required. Adjust fuel system only when indicated by the computer Command Control (CCC) System Performance Check or poor engine performance.
Damage to the HEI electronic module and/or coil may result if "TACH" terminal is grounded. Do not remove spark plug wires with engine running. This would cause an overly rich mixture which may damage catalytic converter.
Before making compression test or cranking engine with remote starter switch, disconnect battery terminal connector from distributor.