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Formula Technical
This Page:
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: Speedometer gears
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 |
VIN Code |
Transmission |
Engine |
Induction |
Displacement. |
Bore | Stroke |
Compression Ratio |
Horsepower |
Torque |
---|---|---|---|---|---|---|---|---|---|
S | M5, A4 | LB8 60°V6 | 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, AT | 10088155 | .350 | .384 | 179 | 194 | 109.0 | (108/-112) | 155 |
305 LG4 (Export NM5 Canada ) | ? | 14088841 | |||||||
305 LB9 | AT | 10088155 | .350 | .384 | 179 | 194 | 109.0 | (108/-112) | 165 |
305 LB9 | M5 | 14093643 | .404 | .415 | 202 | 207 | 114.5 | (115/-114) | 205 |
305 LB9 (Export NM8) | A4 | 14093643 | .404 | .415 | 202 | 207 | 114.5 | (115/-114) | 205 |
350 B2L (L98) | AT | 14093643 | .404 | .415 | 202 | 207 | 114.5 | (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
7 | Model Year (1987) |
YP | 305 CID Application |
M | Transmission Type (THM 700-R4) |
Y | 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