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Technical

Go to: Weight Information

Go to: Engine Information

                - Camshaft Data

                - Engine Head Data

Go to: Transmission Information

Go to: Rear Axel Information

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Model Weight Base Price Production
Firebird V6 3,121  

23,099

Firebird V8  3,287  
Firebird V6 (Conv) --

1,265

Firebird V8 (Conv) --
Formula 3,370   1052 (22 1LE)
Firehawk --   19
Trans Am 3,343 971 (9 1LE)
Trans Am (Conv) -- 663
GTA 3,456   508

 


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"

# NOTE: These heads had the "Swirl Flow Design"


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:1YPMYXXXXXXXXX267A

2 Model Year (1992)
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 1991 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, 1992 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.

 

In 1990 The Borg & Warner was dropped and only the Saginaw rear axel remained, These all have 10 cover bolts, and a  7.625" size Carrier

 

RPO Codes

Axel

Code 

Ratio  Type Disc/ Drum

G80 GU6

2ON 3.42 Posi  

G80 GU5

2PM 3.23 Posi.  

G80 GU6

2PN 3.42 Posi.  

G80 GU4

6HB 3.08 Posi  

GU6

6HE 3.42 Std  

GU2

6HE 2.73 Std  

G80 GU6

6HF 3.42 Posi  

GU5

6HJ 3.23 Std  

GU4

6HK 3.08 Std  

GU6

6HL

3.42

Std  

GU2

6HP 2.73 Std  

G80 GU2

6HT 2.73 Posi  

G80 GU5

6PM  3.23 Posi  

G80 GU6

6PN 3.42 Posi  

G80 GW6

8EV 3.27 Posi  

GM3

G80

8EW 3.45 Posi  

GU4

8HB

3.08

Std  

G80 GU2

8HE 2.73 Posi  

G80 GU4

8HF

3.08

Posi  

GU5 

8HJ

3.23

Std  

GU4

8HK

3.08

Std  

GU6

8HL

3.42

Std  

GU2

8HP

2.73

Std  

G80 GU2

8HT 2.73 Posi  

G80

9ET 2.77 Posi  

 


 

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