Chevy V8 specs from F-Body Cars
85 - 92
| Yr | Model | Trans | Engine code/type |
CR | Displ. | HP | Torque | Induc- tion |
Manual std. |
Manual opt. (G92) |
Auto std. |
Auto opt. (G92) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 85 | Z28 Trans Am |
A4 | LB9 V8 | 9.5:1 | 5.0 (305) | 215@4400 | 275@3200 | TPI | ---- | ---- | 3.23 | ---- |
| 85 | IROC Trans Am |
A4 | LB9 V8 | 9.5:1 | 5.0 (305) | 215@4400 | 275@3200 | TPI | ---- | ---- | 3.23 | 3.42 |
| Yr | Model | Trans | Engine code/type |
CR | Displ. | HP | Torque | Induc- tion |
Manual std. |
Manual opt. (G92) |
Auto std. |
Auto opt. (G92) |
| 86 | Z28 Trans Am |
A4 | LB9 V8 | 9.5:1 | 5.0 (305) | 190@4000 | 285@2800 | TPI | ---- | ---- | 2.73 | 3.23 |
| 86 | IROC Trans Am |
A4 | LB9 V8 | 9.5:1 | 5.0 (305) | 190@4000 | 285@2800 | TPI | ---- | ---- | 2.73 | 3.42 |
| 86 | IROC | A4 | +L98 V8 | 9.5:1 | 5.7 (350) | 220@4200 | 320@3200 | TPI | ---- | ---- | 3.27* | ---- |
*only 74 produced +only 50 produced *Borg-Warner rear axle |
||||||||||||
| Yr | Model | Trans | Engine code/type |
CR | Displ. | HP | Torque | Induc- tion |
Manual std. |
Manual opt. (G92) |
Auto std. |
Auto opt. (G92) |
| 87 | Z28 Formula Trans Am |
A4 | LB9 V8 | 9.3:1 | 5.0 (305) | 190@4000 | 295@3200 | TPI | ---- | ---- | 2.73 | ---- |
| 87 | Z28 Formula Trans Am |
M5 | LB9 V8 | 9.3:1 | 5.0 (305) | 215@4400 | 295@3200 | TPI | 3.08 | ---- | ---- | ---- |
| 87 | IROC Formula Trans Am |
M5,A4 | LG4 V8 | 9.3:1 | 5.0 (305) | 170@4400 | 250@2800 | 4bbl | 3.23 | ---- | 2.73 | ---- |
| 87 | IROC Formula Trans Am |
A4 | LB9 V8 | 9.3:1 | 5.0 (305) | 190@4000 | 295@3200 | TPI | ---- | ---- | 2.73 | 3.23 |
| 87 | IROC Formula Trans Am |
M5 | LB9 V8 | 9.3:1 | 5.0 (305) | 215@4400 | 295@3200 | TPI | 3.08 | 3.45* | ---- | ---- |
| 87 | IROC Formula Trans Am T/A GTA |
A4 | L98 V8 | 9.3:1 | 5.7 (350) | 225@4400 | 330@2800 | TPI | ---- | ---- | 3.27* | ---- |
| *Borg-Warner rear axle *RS available in only California | ||||||||||||
| Yr | Model | Trans | Engine code/type |
CR | Displ. | HP | Torque | Induc- tion |
Manual std. |
Manual opt. (G92) |
Auto std. |
Auto opt. (G92) |
| 88 | Coupe Firebird |
M5,A4 | LB8 V6 | 8.9:1 | 2.8 (173) | 135@4900 | 160@3900 | MFI | 3.42 | ---- | 3.42 | ---- |
| 88 | Coupe Firebird |
M5,A4 | LO3 V8 | 9.3:1 | 5.0 (305) | 170@4000 | 255@2400 | TBI | 3.08 | ---- | 2.73 | ---- |
| 88 | IROC Formula Trans Am |
M5,A4 | LO3 V8 | 9.3:1 | 5.0 (305) | 170@4000 | 255@2400 | TBI | 3.08 | ---- | 2.73 | ---- |
| 88 | IROC Formula Trans Am |
A4 | LB9 V8 | 9.3:1 | 5.0 (305) | 195@4000 | 295@2800 | TPI | ---- | ---- | 2.73 | 3.23 |
| 88 | IROC Formula Trans Am |
M5 | LB9 V8 | 9.3:1 | 5.0 (305) | 220@4400 | 290@3200 | TPI | 3.08 | 3.45* | ---- | ---- |
| 88 | IROC Formula Trans Am T/A GTA |
A4 | L98 V8 | 9.3:1 | 5.7 (350) | 230@4400 | 330@3200 | TPI | ---- | ---- | 2.77* | 3.27* |
| *Borg-Warner rear axle | ||||||||||||
| Yr | Model | Trans | Engine code/type |
CR | Displ. | HP | Torque | Induc- tion |
Manual std. |
Manual opt. (G92) |
Auto std. |
Auto opt. (G92) |
| 89 | Coupe Firebird |
M5,A4 | LB8 V6 | 8.9:1 | 2.8 (173) | 135@4900 | 160@3900 | MFI | 3.42 | ---- | 3.42 | ---- |
| 89 | RS Firebird |
M5,A4 | LO3 V8 | 9.3:1 | 5.0 (305) | 170@4400 | 255@2400 | TBI | 3.08 | ---- | 2.73 | ---- |
| 89 | IROC Formula Trans Am |
M5,A4 | LO3 V8 | 9.3:1 | 5.0 (305) | 170@4400 | 255@2400 | TBI | 3.08 | ---- | 2.73 | ---- |
| 89 | IROC Formula Trans Am |
A4 | LB9 V8 | 9.3:1 | 5.0 (305) | 195@4000 | 295@2800 | TPI | ---- | ---- | 2.73 | ---- |
| 89 | IROC Formula Trans Am |
M5 | LB9 V8 | 9.3:1 | 5.0 (305) | 220@4400 | 290@3200 | TPI | 3.08 | ---- | ---- | ---- |
| 89 | IROC Formula Trans Am |
M5 | LB9 V8 | 9.3:1 | 5.0 (305) | 230@4600 | 300@3200 | TPI | ---- | 3.45* | ---- | ---- |
| 89 | IROC Formula Trans Am |
A4 | L98 V8 | 9.3:1 | 5.7 (350) | 230@4400 | 330@3200 | TPI | ---- | ---- | 2.77* | ---- |
| 89 | IROC Formula Trans Am |
A4 | L98 V8 | 9.3:1 | 5.7 (350) | 240@4400 | 345@3200 | TPI | ---- | ---- | ---- | 3.27* |
| *Borg-Warner rear axle | ||||||||||||
| Yr | Model | Trans | Engine code/type |
CR | Displ. | HP | Torque | Induc- tion |
Manual std. |
Manual opt. (G92) |
Auto std. |
Auto opt. (G92) |
| 90 | RS Firebird |
M5,A4 | LH0 V6 | 8.5:1 | 3.1 (191) | 140@4400 | 180@3600 | MFI | 3.42 | ---- | 3.23 | ---- |
| 90 | RS Firebird |
M5,A4 | LO3 V8 | 9.3:1 | 5.0 (305) | 170@4000 | 255@2400 | TBI | 3.08 | ---- | 2.73 | ---- |
| 90 | IROC Formula Trans Am |
M5,A4 | LB9 V8 | 9.3:1 | 5.0 (305) | 210@4400 | 285@3200 | TPI | 3.08 | ---- | 2.73 | ---- |
| 90 | IROC Formula Trans Am |
M5 | LB9 V8 | 9.3:1 | 5.0 (305) | 230@4400 | 300@3200 | TPI | ---- | 3.42 | ---- | ---- |
| 90 | IROC Formula Trans Am T/A GTA |
A4 | L98 V8 | 9.3:1 | 5.7 (350) | 245@4400 | 345@3200 | TPI | ---- | ---- | ---- | 3.23 |
| Yr | Model | Trans | Engine code/type |
CR | Displ. | HP | Torque | Induc- tion |
Manual std. |
Manual opt. (G92) |
Auto std. |
Auto opt. (G92) |
| 91 | RS Firebird |
M5,A4 | LH0 V6 | 8.5:1 | 3.1 (191) | 140@4400 | 185@3600 | MFI | 3.42 | ---- | 3.23 | ---- |
| 91 | RS Firebird |
M5,A4 | LO3 V8 | 9.3:1 | 5.0 (305) | 170@4000 | 255@2400 | TBI | 3.08 | ---- | 2.73 | ---- |
| 91 | Z28 Formula Trans Am |
M5,A4 | LB9 V8 | 9.3:1 | 5.0 (305) | 205@4200 | 285@3200 | TPI | 3.08 | ---- | 2.73 | ---- |
| 91 | Z28 Formula Trans Am |
M5 | LB9 V8 | 9.3:1 | 5.0 (305) | 230@4200 | 300@3200 | TPI | ---- | 3.42 | ---- | ---- |
| 91 | Z28 Formula Trans Am |
A4 | L98 V8 | 9.3:1 | 5.7 (350) | 245@4400 | 345@3200 | TPI | ---- | ---- | ---- | 3.23 |
| Yr | Model | Trans | Engine code/type |
CR | Displ. | HP | Torque | Induc- tion |
Manual std. |
Manual opt. (G92) |
Auto std. |
Auto opt. (G92) |
| 92 | RS Firebird |
M5,A4 | LH0 V6 | 8.5:1 | 3.1 (191) | 140@4400 | 180@3600 | MFI | 3.42 | ---- | 3.23 | ---- |
| 92 | RS Firebird |
M5,A4 | LO3 V8 | 9.3:1 | 5.0 (305) | 170@4000 | 255@2400 | TBI | 3.08 | ---- | 2.73 | ---- |
| 92 | Z28 Formula Trans Am |
M5,A4 | LB9 V8 | 9.3:1 | 5.0 (305) | 205@4200 | 285@3200 | TPI | 3.08 | ---- | 2.73 | ---- |
| 92 | Z28 Formula Trans Am |
M5 | LB9 V8 | 9.3:1 | 5.0 (305) | 230@4200 | 300@3200 | TPI | ---- | 3.42 | ---- | ---- |
| 92 | Z28 Formula Trans Am T/A GTA |
A4 | L98 V8 | 9.3:1 | 5.7 (350) | 245@4400 | 345@3200 | TPI | ---- | ---- | ---- | 3.23 |
Engine codes: (8th digit of VIN) H LG4 7 LU5 E L03 G L69 F LB9 8 L98 2 LQ9 1 LC1 S LB8 T LH0 Abbreviations: 2 bbl - 2 Barrel 4bbl - 4 Barrel 4bbl HO - 4 Barrel H.O. (High Output) CFI - Cross Fire Injection SFI - Sequential Fuel Injection TPI - Tuned Port Injection TBI - Throttle Body Injection MFI - MultiPoint Fuel Injection
| Lift | Duration | Lobe | Rocker | ||||
|---|---|---|---|---|---|---|---|
| Motor | GM P/N | Int. | Exh. | Int. | Exh. | Separation | Arm Ratio |
| 1985 (L69 and LB9) | |||||||
| 305 AT | 14088843 | .403 | .415 | 202 | 206 | 114.5 | (115/-114) |
| 1986 (LB9) | |||||||
| 305 AT | 14094097 | .350 | .385 | 178 | 194 | 109.0 | (106/-112) |
| 1987 | |||||||
| 305 AT (LB9 | 10088155* | .350 | .384 | 179 | 194 | 109.0 | (108/-112) |
| 305 5spd / 350 AT (LB9/ L98) |
14093643* | .404 | .415 | 202 | 207 | 114.5 | (115/-114) |
| 305 (LM1 Police Pack.) |
14093640* | .383 | .404 | 291 | 202 | 112 | (108/-116) |
| 1988, 1989 | |||||||
| 305 AT | 10088155* | .350 | .384 | 179 | 194 | 109.0 | (108/-112) |
| 305 5spd / 350 AT | 10066049* | .415 | .430 | 207 | 213 | 117.0 | (116/-118) |
| 1990-1992 | |||||||
| 305 5spd / 305 AT | 10088155* | .350 | .384 | 179 | 194 | 109.0 | |
| 305 G92 5spd / 350 AT | 10111773* | .413 | .428 | 202 | 207 | 114.5 | (116/-116) |
*roller cams