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Formula Technical

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Go to: 87 Weight Information

Go to: 87 Engine Information

Go to: 87 Transmission Information

Go to: 87 Rear Axel Information

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Go to: Engine production numbers (estimates)

 


Model Weight Base Price Production
Firebird V6 3,186 $10,359 42,552
Firebird V8 3,274 $10,759
Formula 3,274 $11,829 13,160
Trans Am 3,350 $13,259 21,779
GTA 3,435 $14,104 11,096

 


Engines:

VIN Code

Transmission

Engine
code/type

Induction

Displacement.

Bore Stroke

Compression

Ratio

Horsepower

Torque

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

M5, A4

LG4 90 V8

4bbl

5.0 (305)

3.74 3.48

8.6:1

170@4400

250@2800

155@4200*
F

A4

LB9 90 V8

TPI

5.0 (305)

3.74 3.48

9.3:1

190@4000

295@3200

165@4400*
F

M5

LB9 90 V8

TPI

5.0 (305)

3.74 3.48

9.3:1

215@4400

295@3200

205@4400*

8

A4

(L98)

B2L 90 V8

TPI

5.7 (350)

4.00 3.48

9.3:1

225@4400

330@2800

210@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
 
Cam Data 

Motor

Trans

GM Part #

Lift

Duration

Lobe

Separation

Rocker

Arm Ratio

Horsepower

Int.

Exh.

Int.

Exh.

305 LG4 M5, AT10088155.350.384179194109.0 (108/-112) 155
305 LG4 (Export NM5 Canada ) ?14088841         
305 LB9 AT 10088155.350.384179194109.0 (108/-112) 165
305 LB9M514093643.404.415202207114.5 (115/-114) 205
305 LB9 (Export NM8)A414093643.404.415202207114.5 (115/-114) 205
350 B2L (L98)AT14093643.404.415202207114.5 (115/-114) 210
 
 
Head Data
Engine

GM Part Number

(Head Casting Number)

Combustion Chamber Valve Diameter
Intake Exh
305 (LG4 & LB9) 10159553 58cc 1.84" 1.5"
350 B2L (L98) 10159552 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

Model Year (1987)
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 1987 production started. The build date code continues with the Julian date until December 31 (365). The sequence then continues until the end of the 1987 production. EXAMPLE: January 20, 1987 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

Disc

Drum

Manufacturer Cover Bolts Carrier Size
GH3 4ET 2.77 Posi  Disc Borg & Warner 9 7.75"
GM3 4EW 3.45 Posi  Disc Borg & Warner 9 7.75"
GU2 2HT 2.73 Posi   Saginaw 10 7.625"
GU2 2HP 2.73 Std Saginaw 10 7.625"
GU2 4HV 2.73 Posi    Saginaw 10 7.625"
GU4 4HB 3.08 Posi    Saginaw 10 7.625"
GU5  4HY 3.23 Posi  Saginaw 10 7.625"
GU5 2HQ 3.23 Posi Saginaw 10 7.625"
GU5 2HA 3.23 Std Saginaw 10 7.625"
GU6 2HL 3.42 Std   Saginaw 10 7.625"
GU6 4HR 3.42 Posi  Saginaw 10 7.625"
GU6 2HR 3.42 Posi   Saginaw 10 7.625"
GW6 4EU 3.27 Posi  Disc Borg & Warner 9 7.75"

 

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