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