1971 Pontiac Firebird Trans Am 455 CID H.O.
Manual Transmission Engine Specifications

Engine Code

WL, WC

Engine RPO

LS5

Displacement

455 CID

Bore x Stroke

4.1522" x 4.121"

Compression Ratio

8.4:1

Horsepower @ RPM (Gross)

335@4800

Horsepower @ RPM (Net)

310@4800

Torque (Lb/Ft) @ RPM (Gross>

480@3600

Torque (Lb/Ft) @ RPM (Net)

410@3600

Head Casting

197

Carburetor

4-bbl

Carburetor - Federal

7071267, 70410273

Camshaft

Part #

9779068

Lift, I/E

.408 / .406

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

288 / 302

Overlap - Degrees

87

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.77"

Distributor

1112073

1971 Pontiac Firebird Trans Am 455 CID H.O.
Automatic Transmission Engine Specifications

Engine Code

YE, YA

Engine RPO

LS5

Displacement

455 CID

Bore x Stroke

4.1522" x 4.121"

Compression Ratio

10.5:1

Horsepower @ RPM (Gross)

335@4800

Horsepower @ RPM (Net)

310@4800

Torque (Lb/Ft) @ RPM (Gross)

480@3600

Torque (Lb/Ft) @ RPM (Net)

410@3600

Head Casting

197

Carburetor

4-bbl

Carburetor - Federal

7041268, 7041270

Camshaft

Part #

9779068

Lift, I/E

.527 / .527

Rocker Arm Ratio

1.65:1

Duration I/E - Degrees

308 / 320

Overlap - Degrees

87

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.77"

Distributor

1112073