1970 Pontiac Firebird Trans Am 400 CID Ram Air IV
Manual Transmission Engine Specifications

Engine Code

WH

Displacement

400 CID

Bore x Stroke

4.1212" x 3.750"

Compression Ratio

10.5:1

Horsepower @ RPM

370@5500

Torque (Lb/Ft) @ RPM

445@3900

Head Casting

614

Carburetor

4-bbl

Carburetor - Federal

7040273

Carburetor - Calif

7040573

Intake Manifold

9799084

Camshaft

9794041

Part #

9794041

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"

Exhaust Manifolds

R 9799721

Exhaust Manifolds

L 478141

Distributor

1112013

1970 Pontiac Firebird Trans Am 400 CID Ram Air IV
Automatic Transmission Engine Specifications

Engine Code

XN

Displacement

400 CID

Bore x Stroke

4.1212" x 3.750"

Compression Ratio

10.5:1

Horsepower @ RPM

370@5500

Torque (Lb/Ft) @ RPM

445@3900

Head Casting

614

Carburetor

4-bbl

Carburetor - Federal

7040270

Carburetor - Calif

7040570

Intake Manifold

9799084

Camshaft

9779068

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"

Exhaust Manifolds

R 9799721

Exhaust Manifolds

L 478141

Distributor

1112013