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Engines
1977 403 (6.6L)
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