1977 Pontiac Firebird Trans Am 400 CID
Automatic Transmission Engine Specifications

Engine Code	XA
Engine RPO	L78
Displacement	400 CID
Bore x Stroke	4.1212" x 3.750"
Compression Ratio	7.6:1
Horsepower @ RPM	180@3600
Torque (Lb/Ft) @ RPM	325@1600
Head Casting	6X
Carburetor	4-bbl
Carburetor - Federal	17057274
Intake Manifold	525355
Camshaft
Part #	527471
Lift, I/E	/
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	1103269 w/2.92 & under axle ratio
Distributor	1103271 w/2.93 & higher axle ratio