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

Engine Code

WS

Displacement

400 CID

Bore x Stroke

4.1212" x 3.750"

Compression Ratio

10.5:1

Horsepower @ RPM

345@5000

Torque (Lb/Ft) @ RPM

430@3400

Head Casting

12

Carburetor

4-bbl

Carburetor - Federal

7040273

Carburetor - Calif

7040573

Intake Manifold

9799068

Camshaft

Part #

9779068

Lift, I/E

.410 / .413

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

288 / 302

Overlap - Degrees

63

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.77"

Exhaust Manifolds

R 9799720

Exhaust Manifolds

L 478140

Distributor

1112024

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

Engine Code

YZ

Displacement

400 CID

Bore x Stroke

4.1212" x 3.750"

Compression Ratio

10.5:1

Horsepower @ RPM

345@5000

Torque (Lb/Ft) @ RPM

430@3400

Head Casting

12, 13

Carburetor

4-bbl

Carburetor - Federal

7040270

Carburetor - Calif

7040570

Intake Manifold

9799068

Camshaft

Part #

9779068

Lift, I/E

.410 / .413

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

288 / 302

Overlap - Degrees

63

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.77"

Exhaust Manifolds

R 9799720

Exhaust Manifolds

L 478140

Distributor

1112009