1974 Pontiac Firebird Trans Am 455 CID Super Duty
Manual Transmission Engine Specifications

Engine Code	W8
Engine RPO	LS2
Displacement	455 CID
Bore x Stroke	4.1522" x 4.121"
Compression Ratio	8.3:1
Horsepower @ RPM	290@4000
Torque (Lb/Ft) @ RPM	395@3200
Head Casting	16
Carburetor	4-bbl
Carburetor	7044273
Intake Manifold	495107
Camshaft
Part #
Lift, I/E	.410 / .410
Rocker Arm Ratio	1.5:1
Duration I/E - Degrees	301 / 313
Overlap - Degrees	76
Intake Valve Dia -	2.11"
Exhaust Valve - Dia	1.77"
Exhaust Manifold - Right	490802
Exhaust Manifold - Left	490803
Distributor

1974 Pontiac Firebird Trans Am 455 CID Super Duty
Automatic Transmission Engine Specifications

Engine Code	Y8
Engine RPO	LS2
Displacement	455 CID
Bore x Stroke	4.1522" x 4.121"
Compression Ratio	8.3:1
Horsepower @ RPM	290@4000
Torque (Lb/Ft) @ RPM	395@3200
Head Casting	16
Carburetor	4-bbl
Carburetor	7044270
Intake Manifold	495107
Camshaft
Part #
Lift, I/E	.410 / .410
Rocker Arm Ratio	1.5:1
Duration I/E - Degrees	301 / 313
Overlap - Degrees	76
Intake Valve Dia -	2.11"
Exhaust Valve - Dia	1.77"
Exhaust Manifold - Right	490802
Exhaust Manifold - Left	490803
Distributor