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