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Engines
1977 400 (6.6L)
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