COMPANY NAME    Trans AM

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1975 Pontiac Trans AM

1975 Pontiac Firebird Trans AM

In what had been a sea of pony car competitors, the Pontiac Firebird and Trans AM were all alone for 1975. The Camaro Z28, AMC Javelin, Plymouth Barracuda, and Dodge Challenger all were discontinued. The Ford Mustang was now offered on a Pinto platform and boasted a top engine offering of a 105 bhp 2.8 liter V6! The 1975 Pontiac Firebird featured a new front end (it's third in three years) and a much improved rear window, which greatly improved visibility. The instrument panel stayed the same, but the old 160 mph speedometer was replaced by a new 100 mph unit, to better reflect the new times. The base 400 cid V8 Trans Am engine put out a pitiful 185 bhp, but still cranked out 310 lb-ft of torque. But the big news was what was lost: No Super Duty 455 engine, no Turbo-Hydramatic 400 automatic transmission, no Muncie Four-Speed Manual Transmission, no true dual exhausts. The main culprit: the new Federally mandated Catalytic Converters. The 455 V8 was re-introduced mid-year in "H.O." guise, but it was just the 455 engine from the Bonneville and produced only 200 bhp.

1975 Pontiac Firebird Trans AM Production: Trans Am: 27,274
                    Formula:   13,670


PONTIAC Firebird PRODUCTION FIGURES
MODEL MANUAL AUTOMATIC TOTAL
Total Base Firebird n/a n/a 22,293
Total Firebird Esprit n/a n/a 20,826
Total Firebird Formula n/a n/a 13,670
Trans Am 400 6,140 20.277 26,417
Trans Am 455 857 - 857
Total Trans Am 6,997 20,277 27,274
Grand Total - - 84,063


1975 Pontiac Firebird Trans AM Engines:
350 V8 155bhp.
400 V8 185 bhp, 310 lb-ft.
455 V8 200 bhp @ 3800 rpm, 330 lb-ft @ 2000 rpm.
455 (HO) V8 200 bhp.
1975 Pontiac Firebird Trans AM Performance:
455/200: 1/4 mile in 16.1 seconds @ 89 mph




 

1975 Pontiac Firebird Trans Am 400 CID
Manual Transmission Engine Specifications

 

Engine Code

WT

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

5C
6X after mid-year

Carburetor

4-bbl

Carburetor - Federal

7045263

   

Intake Manifold

495106

Camshaft

Part #

9779066

Lift, I/E

.407 / .407

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

273 / 283

Overlap - Degrees

59

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.66"

Distributor

   

 

1975 Pontiac Firebird Trans Am 400 CID
Automatic Transmission Engine Specifications

 

Engine Code

YS

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

5C
6X after mid-year

Carburetor

4-bbl

Carburetor - Federal

7045274

Carburetor - California

7045564

Intake Manifold

495106

Camshaft

Part #

9779066

Lift, I/E

.407 / .407

Rocker Arm Ratio

1.5:1

Duration I/E - Degrees

273 / 283

Overlap - Degrees

54

Intake Valve Dia -

2.11"

Exhaust Valve - Dia

1.66"

Distributor



 

 

1975 Pontiac Firebird Trans Am 455 CID
Manual Transmission Engine Specifications

 

Engine Code

WX

Engine RPO

L75

Displacement

455 CID

Bore x Stroke

4.1522" x 4.121"

Compression Ratio

7.6:1

Horsepower @ RPM

200@3500

Torque (Lb/Ft) @ RPM

330@2000

Head Casting

495351, 5C

Carburetor

4-bbl

Carburetor - Federal

NA

Intake Manifold

496140

Camshaft

Part #

9779067

Lift, I/E

.407 / .407

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