1973 Pontiac Firebird Trans Am 455 CID
Manual Transmission Engine Specifications

Engine Code	WT, WW, ZZ, ZE
Engine RPO	L75
Displacement	455 CID
Bore x Stroke	4.1522" x 4.121"
Compression Ratio	8.0:1
Horsepower @ RPM	250@4000
Torque (Lb/Ft) @ RPM	3700@2800
Head Casting	7F6
Carburetor	4-bbl
Carburetor - Federal	7043273
Intake Manifold	497244
Camshaft
Part #
Lift, I/E	.410 / .414
Rocker Arm Ratio	1.5:1
Duration I/E - Degrees	273 / 289
Overlap - Degrees	54
Intake Valve Dia -	2.11"
Exhaust Valve - Dia	1.66"
Distributor

1973 Pontiac Firebird Trans Am 455 CID
Automatic Transmission Engine Specifications

Engine Code	X7, XE, XL, XM, YA, YC, YD
Engine RPO	L75
Displacement	455 CID
Bore x Stroke	4.1522" x 4.121"
Compression Ratio	8.0:1
Horsepower @ RPM	250@4000
Torque (Lb/Ft) @ RPM	370@2800
Head Casting	7F6
Carburetor	4-bbl
Carburetor - Federal	7043262, 7043272
Intake Manifold	497244
Camshaft
Part #
Lift, I/E	.410 / .414
Rocker Arm Ratio	1.5:1
Duration I/E - Degrees	273 / 289
Overlap - Degrees	54
Intake Valve Dia -	2.11"
Exhaust Valve - Dia	1.66"
Distributor