1976 Pontiac Firebird Trans Am 400 CID
Manual Transmission Engine Specifications

Engine Code
Engine RPO	L78
Displacement	400 CID
Bore x Stroke	4.1212" x 3.750"
Compression Ratio	7.6:1
Horsepower @ RPM	185@3600
Torque (Lb/Ft) @ RPM	310@1600
Head Casting	4X
Carburetor	4-bbl
Carburetor - Federal	7043273
Camshaft
Part #
Lift, I/E	NA / NA
Rocker Arm Ratio	1.5:1
Duration I/E - Degrees	NA / NA
Overlap - Degrees	NA
Intake Valve Dia -	2.11"
Exhaust Valve - Dia	1.66"
Distributor

1976 Pontiac Firebird Trans Am 400 CID
Automatic Transmission Engine Specifications

Engine Code
Engine RPO	L75
Displacement	400 CID
Bore x Stroke	4.1212" x 3.750"
Compression Ratio	7.6:1
Horsepower @ RPM	185@3600
Torque (Lb/Ft) @ RPM	310@1600
Head Casting	4X
Carburetor	4-bbl
Carburetor - Federal	7043262, 7043272
Camshaft
Part #
Lift, I/E	NA / NA
Rocker Arm Ratio	1.5:1
Duration I/E - Degrees	NA / NA
Overlap - Degrees	55
Intake Valve Dia -	2.11"
Exhaust Valve - Dia	1.66"
Distributor