1976 Pontiac Firebird Trans Am 400 CID
Manual Transmission Engine Specifications

Engine Code

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

4X

Carburetor

4-bbl

Carburetor - Federal

7043273

Camshaft

Part #

Lift, I/E

NA / NA

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

NA / NA

Overlap - Degrees

NA

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.66"

Distributor

1976 Pontiac Firebird Trans Am 400 CID
Automatic Transmission Engine Specifications

Engine Code

Engine RPO

L75

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

4X

Carburetor

4-bbl

Carburetor - Federal

7043262, 7043272

Camshaft

Part #

Lift, I/E

NA / NA

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

NA / NA

Overlap - Degrees

55

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.66"

Distributor