1974 Pontiac Firebird Trans Am 400 CID
Manual Transmission Engine Specifications

Engine Code

WT, WW, ZZ, ZE

Engine RPO

Displacement

400 CID

Bore x Stroke

4.1212" x 3.750"

Compression Ratio

8.0:1

Horsepower @ RPM

225@4000

Torque (Lb/Ft) @ RPM

330@2800

Head Casting

4X

Carburetor

4-bbl

Carburetor - Federal

7043273

Intake Manifold

495106

Camshaft

Part #

Lift, I/E

.410 / .415

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

273 / 282

Overlap - Degrees

55

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.66"

Distributor

1973 Pontiac Firebird Trans Am 400 CID
Automatic Transmission Engine Specifications

Engine Code

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

Engine RPO

Displacement

400 CID

Bore x Stroke

4.1212" x 3.750"

Compression Ratio

8.0:1

Horsepower @ RPM

225@4000

Torque (Lb/Ft) @ RPM

330@2800

Head Casting

4X

Carburetor

4-bbl

Carburetor - Federal

7043262, 7043272

Intake Manifold

495106

Camshaft

Part #

Lift, I/E

.410 / .415

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

273 / 282

Overlap - Degrees

55

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.66"

Distributor