Technical

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Note: These Numbers are for 1990 Vehicles only, 1991 Production started early and some other sources will include 1990 1/2 Firebirds, I include those numbers into 1991.

Engines:

*Note: Flammang, James M. & Kowalke, Ron. 1999. "Standard catalog of American cars 1976-1999". Krause Publications, pp 873

Camshaft Data

*roller cams

Head Data

These heads had the "Swirl Flow Design"

* NOTE: These Numbers are not yet confirmed

Transmissions:

700R4 Automatic
Transmission code is located on the right rear oil pan rail and includes the year, model, Julian build date and shift built.
Example:9YPMYXXXXXXXXX267A

Build Date Code
Starts with the Julian date (day of the year) on which 1990 production started. The build date code continues with the Julian date until December 31 (365). The sequence then continues until the end of the 1990 production. EXAMPLE: January 20, 1990 would translate to a build date code of 385.

Shift Code

Note:
In addition to the transmission production code number, all passenger cars have a portion of the vehicle identification number stamped on the transmission. The condensed vehicle identification number consists of the division identification number, model year, assembly plant designation and vehicle build sequence number.

The Rear Axle Codes
Is a two letter code stamped on the front passenger side of the axle tube or on an identification tag attached to the carrier cover. It identifies that axle code ratio and if the axle is equipped with the Safe-T-Track option.