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Model Weight Base Price Production
Firebird V6 3,106 $11,320

13,204

Firebird V8  3,266 $11,670
Formula 3,338 $14,610 4,832
Trans Am 3,338 $16,510 1,054
GTA 3,554 $23,320 1,442

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:

VIN Code

Transmission

Engine
code/type

Induction

Displacement.

Bore Stroke

Comp.

Ratio

Horsepower

Torque

Cats
T M5, A4 LHO 60V8 MPFI 3.1 (191) 3.50 3.31 8.75:1 135@4400 180@3600 1
E

M5, A4

LO3 90 V8

TBI

5.0 (305)

3.74 3.48

9.3:1

170@4400

255@2400

1
F

M5, A4

LB9 90 V8

TPI

5.0 (305)

3.74 3.48

9.3:1

200@4400

300@2800

1
F

M5, A4

LB9 90 V8

TPI

5.0 (305)

3.74 3.48

9.3:1

225@4600

290@3200

2

8

A4

B2L (L98)

90 V8

TPI

5.7 (350)

4.00 3.48

9.3:1

235@4400

330@3200

2
 
*Note: Flammang, James M. & Kowalke, Ron. 1999. "Standard catalog of American cars 1976-1999". Krause Publications, pp 873

Camshaft Data

Motor Trans

GM 

Part #

Lift Duration

Lobe

Separation

Rocker

Arm Ratio

Int. Exh. Int. Exh.
305 LO3

A4/M5

10088155*

.350

.384

179

194

109.0

(108/-112)
305 LB9

M5 & A4

10111773*

.413

.428

202

207

114.5

(116/-116)
350 L98 

A4 

10111773*

.413

.428

202

207

114.5

(116/-116)

*roller cams

 

Head Data
Engine GM Part Number Casting Numbers Combustion Chamber Valve Diameter
Intake Exh
305 (LO3) 10159551   cc 1.84" 1.5"
305 (LB9) 10159553   58cc 1.84" 1.5"
350 B2L (L98) 10159552 14101083, 14096217 64cc 1.94" 1.5"

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

0 Model Year (1990)
YP  305 CID Application
M Transmission Type (THM 700-R4)
Build Location (Toledo)
267  Julian Date

A* 

Shift Built (1st)

 

Code 

CID

FB  192

FK

350 TPI
FT  305 TBI
FU  350 TPI
FX 350 TPI
FZ 305 TPI

 

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

Code Shift
A & B  First shift
C & H Second shift
D Day
N Night

 

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.

Code  Ratio  Type
2ON 3.42 Posi
2PM 3.23 Posi.
2PN 3.42 Posi.
6HB 3.08 Posi
6HE 3.42 Std
6HE 2.73 Std
6HF 3.42 Posi
6HJ 3.23 Std
6HK 3.08 Std
6HL

3.42

Std
6HP 2.73 Std
6HT 2.73 Posi
6PM  3.23 Posi
6PN 3.42 Posi
8EV 3.27 Posi
8EW 3.45 Posi
8HB

3.08

Std
8HE 2.73 Posi
8HF

3.08

Posi
8HJ

3.23

Std
8HK

3.08

Std
8HL

3.42

Std
8HP

2.73

Std
8HT 2.73 Posi
9ET 2.77 Posi

Borg & Warner 7.75" Carrier with 9 Bolt axel was dropped and only the Saginaw 7.625 Carrier with 10 Bolt axel Remained


 

Resources:
Amos Press Inc. Catalog of FIREBIRD ID Numbers 1967-1993