1975 Pontiac Firebird Trans Am 400 CID
Manual Transmission Engine Specifications

Engine Code

WT

Engine RPO

L78

Displacement

400 CID

Bore x Stroke

4.1212" x 3.750"

Compression Ratio

7.6:1

Horsepower @ RPM

185@3600

Torque (Lb/Ft) @ RPM

310@1600

Head Casting

5C

Carburetor

4-bbl

Carburetor - Federal

7045263

Intake Manifold

495106

Camshaft

Part #

Lift, I/E

.377 / .415

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

269 / 282

Overlap - Degrees

59

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.66"

Distributor

1975 Pontiac Firebird Trans Am 400 CID
Automatic Transmission Engine Specifications

Engine Code

YS

Engine RPO

L78

Displacement

400 CID

Bore x Stroke

4.1212" x 3.750"

Compression Ratio

7.6:1

Horsepower @ RPM

185@3600

Torque (Lb/Ft) @ RPM

310@1600

Head Casting

5C

Carburetor

4-bbl

Carburetor - Federal

7045274

Carburetor - California

7045564

Intake Manifold

495106

Camshaft

Part #

Lift, I/E

.377 / .415

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