1971 Pontiac Firebird Trans Am 455 CID H.O.
Manual Transmission Engine Specifications

Engine Code	WL, WC
Engine RPO	LS5
Displacement	455 CID
Bore x Stroke	4.1522" x 4.121"
Compression Ratio	8.4:1
Horsepower @ RPM (Gross)	335@4800
Horsepower @ RPM (Net)	310@4800
Torque (Lb/Ft) @ RPM (Gross>	480@3600
Torque (Lb/Ft) @ RPM (Net)	410@3600
Head Casting	197
Carburetor	4-bbl
Carburetor - Federal	7071267, 70410273
Camshaft
Part #	9779068
Lift, I/E	.408 / .406
Rocker Arm Ratio	1.5:1
Duration I/E - Degrees	288 / 302
Overlap - Degrees	87
Intake Valve Dia -	2.11"
Exhaust Valve - Dia	1.77"
Distributor	1112073

1971 Pontiac Firebird Trans Am 455 CID H.O.
Automatic Transmission Engine Specifications

Engine Code	YE, YA
Engine RPO	LS5
Displacement	455 CID
Bore x Stroke	4.1522" x 4.121"
Compression Ratio	10.5:1
Horsepower @ RPM (Gross)	335@4800
Horsepower @ RPM (Net)	310@4800
Torque (Lb/Ft) @ RPM (Gross)	480@3600
Torque (Lb/Ft) @ RPM (Net)	410@3600
Head Casting	197
Carburetor	4-bbl
Carburetor - Federal	7041268, 7041270
Camshaft
Part #	9779068
Lift, I/E	.527 / .527
Rocker Arm Ratio	1.65:1
Duration I/E - Degrees	308 / 320
Overlap - Degrees	87
Intake Valve Dia -	2.11"
Exhaust Valve - Dia	1.77"
Distributor	1112073