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Technical

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Model Weight Base Price Production
Firebird V6 3,102 $10,999 28,973
Firebird V8 3,300* $11,399
Formula 3,296 $11,999 13,475
Trans Am 3,355 $13,999 8,793
GTA 3,406 $19,922 11,214

* Note: 89 weight data, 88 Weight data for V8 Firebird was not available 


Engines:

This Section:

Go to: Basic Engine data

Go to: Camshaft Data

Go to: Head Data

 

VIN Code

Transmission

Engine
code/type

Induction

Displacement.

Bore Stroke

Compression

Ratio

Horsepower

Torque

S M5, A4 LB8 60V6 MPFI 2.8 (173) 3.50 2.99 8.9:1 135@5100 160@3900
E

M5, A4

LO3 90 V8

TBI

5.0 (305)

3.74 3.48

9.3:1

170@4400

255@2400

170@4000*
F

A4

LB9 90 V8

TPI

5.0 (305)

3.74 3.48

9.3:1

195@4000

295@2800

190@4000*
F

M5

LB9 90 V8

TPI

5.0 (305)

3.74 3.48

9.3:1

220@4400

285@3200

215@4400*

8

A4

B2L (L98) 90 V8

TPI

5.7 (350)

4.00 3.48

9.3:1

230@4400

330@3200

225@4400*
 
*Note: Flammang, James M. & Kowalke, Ron. 1999. "Standard catalog of American cars 1976-1999". Krause Publications, pp 873
Abbreviations:
A4   - Automatic Transmission 700R4
M5   - 5 Speed Manual Transmission
TBI  - Throttle Body Injection 
TPI  - Tuned Port Injection
MPFI - Multiport Fuel Injection

 

Camshaft Data

 

 

Lift

Duration

Lobe

Rocker

 

Motor

Trans

GM 

Part Number

Int.

Exh.

Int.

Exh.

Separation

Arm Ratio

Horse

 Power

305 LO3

A4/M5

10088155

.350

.384

179

194

109.0

(108/-112)

170

305 LB9 

A4 

10088155

.350

.384

179

194

109.0

(108/-112)

190

305 LB9

M5 

10066049

.415

.430

207

213

117.0

(116/-118)

215

350 L98 

A4 

10066049

.415

.430

207

213

117.0

(116/-118)

225

 

 

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


Transmission:

The 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:7YPMYXXXXXXXXX267A

8 Model Year (1988)
YP  305 CID Application
M Transmission Type (THM 700-R4)
Build Location (Toledo)
267  Julian Date
A*  Shift Built (1st)

 

Code  CID
FK 350
FX 350
YP  305
YW  305
YX  173
YZ  305

 

 

Build Date Code
Starts with the Julian date (day of the year) on which 1988 production started. The build date code continues with the Julian date until December 31 (365). The sequence then continues until the end of the 1988 production. EXAMPLE: January 20, 1988 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.

RPO Codes

Axel

Code

Ratio  Type Manufacturer cover Bolts Carrier Size
G80, GH3, J65 4ET  2.77  Posi  Borg & Warner 9 7.75"
G80, GW6, J65 4EU  3.27  Posi  Borg & Warner 9 7.75"
G80, GM3, J65

4EW 

3.45  Posi  Borg & Warner 9 7.75"
G80, GU4 6HB  3.08  Posi Saginaw 10 7.625"
G80, GU2

6HE

2.73  Posi Saginaw 10 7.625"
G80, GU4

6HF 

3.08  Posi Saginaw 10 7.625"
GU4 6HK  3.08  Std Saginaw 10 7.625"
GU6 6HL  3.42  Std Saginaw 10 7.625"
GU2 6HP  2.73  Std Saginaw 10 7.625"
G80, GU5 6HQ  3.23  Posi Saginaw 10 7.625"
G80, GU2 6HT  2.73  Posi Saginaw 10 7.625"
GM3 7EW  3.45  Posi  Borg & Warner 9 7.75"
1LE, G80, GW6, J65 8EU  3.27  Posi Borg & Warner 9 7.75"
1LE, G80, GM3, J65 8EW  3.45  Posi Borg & Warner 9 7.75"
1LE, G80, GW6, J65 9EQ  3.27  Posi Borg & Warner 9 7.75"

 

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