1973 Pontiac Firebird Trans Am 455 CID
Manual Transmission Engine Specifications

Engine Code

WT, WW, ZZ, ZE

Engine RPO

L75

Displacement

455 CID

Bore x Stroke

4.1522" x 4.121"

Compression Ratio

8.0:1

Horsepower @ RPM

250@4000

Torque (Lb/Ft) @ RPM

3700@2800

Head Casting

7F6

Carburetor

4-bbl

Carburetor - Federal

7043273

Intake Manifold

497244

Camshaft

Part #

Lift, I/E

.410 / .414

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

273 / 289

Overlap - Degrees

54

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.66"

Distributor

1973 Pontiac Firebird Trans Am 455 CID
Automatic Transmission Engine Specifications

Engine Code

X7, XE, XL, XM, YA, YC, YD

Engine RPO

L75

Displacement

455 CID

Bore x Stroke

4.1522" x 4.121"

Compression Ratio

8.0:1

Horsepower @ RPM

250@4000

Torque (Lb/Ft) @ RPM

370@2800

Head Casting

7F6

Carburetor

4-bbl

Carburetor - Federal

7043262, 7043272

Intake Manifold

497244

Camshaft

Part #

Lift, I/E

.410 / .414

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

273 / 289

Overlap - Degrees

54

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.66"

Distributor