1977 Pontiac Firebird Trans Am 403 CID (Oldsmobile)
Automatic Transmission Engine Specifications

Engine Code

U2, U3, VA, VB

Engine RPO

L80

Displacement

403 CID

Bore x Stroke

4.3512" x 3.385"

Compression Ratio

8.0:1

Horsepower @ RPM

185@3600

Torque (Lb/Ft) @ RPM

320@2200

Head Casting

554717

Carburetor

4-bbl

Carburetor - California

17057550 w/o Air Cond

Carburetor - California

17057553 w/ Air Conditioning

Carburetor - High Altitude

17057258

Intake Manifold

411990

Camshaft

Part #

562299

Lift, I/E

.440 / .440

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

NA / NA

Overlap - Degrees

NA

Intake Valve Dia -

2.00"

Exhaust Valve - Dia

1.50"

Distributor