I got this car or what was left of one, the only marking on the body was on
the front driver side finder 442. It was a one owner and it was in a barn
for the last 27 years. the only thing that was good on it was the engine and
trans only. here's a list of are all the numbers on and in the motor.

Year : 1975
Make : Oldsmobile
Model : Cutlass Supreme
Body Style : 2-Door Coupe
Engine & Carb Type : 350 4bbl
Transmission Type : THM 350
Vichel VIN Number : 3J37K5M114616

Engine RPO Code : L-34
Engine Prefix Code : Unknown (Missing) (On Oil Filler Tube)
Engine VIN Number : 35M114616
Production Year & No. : 5032034 (On Oil Filler Tube)

Carburetor Manufacture: Rochester Quadrajet
Model Series ID : 4MC
Model No. : 7045183
Assem. Plant Code : K4
Day Year Code : 2394

Distributor Model No. : 1112936
Assem. Plant Code :
Year Day Code : 4129

Vacuum Model No. : 1973531
Assem. Plant Code :
Year Day Code :

EGR Valve Model No. : 7043522

----------------------------------------
Engine Block

Casting Number : 395558
ID Code : 2
Date Code : 240
Series Code : 10
Casting Code : * CFO
Nickel Con. Code : F9

----------------------------------------
Crank

Casting Number : 418882
ID Code :
Date Code : 231
Casting Code : * CFO

----------------------------------------
Pistons

Casting Number : 411891
Series Code : F
Casting Code :

----------------------------------------
Rods

Casting Number :
Series Code :
Casting Code :

----------------------------------------
Cylinder Heads

Casting Number : 411929
ID Code : 8
Date Code : 225
Series Code : X
Casting Code : * CFD
Casting ID Code : 8

Casting Number : 411929
ID Code : 8
Date Code : 242
Series Code : X
Casting Code : * CFD
Casting ID Code : 8

----------------------------------------
Intake Manifold

Casting Number : 411990
ID Code : 16
Date Code : 239
Series Code : Y
Casting Code : * D3BS
Casting ID Code : W

----------------------------------------
Exhaust Manifold

Casting Number : 568619 RH
ID Code : 13
Date Code : 46
Casting Code : * D9Y


Casting Number : 380001 LH
ID Code : 1
Date Code : 22
Casting Code : * D4

----------------------------------------
Water Pump

Casting Number : 407536
ID Code : 3
Date Code : 126
Casting Code : * CFO
Casting ID Code : 4
Series Code : M

----------------------------------------
Thermostat Housing

Casting Number : 408038
ID Code :
Date Code : 49
Casting Code : *D14
Casting ID Code : 3

----------------------------------------

So is it or not a 442 motor?

 

That is a 350, not a 455. The 455 was not a standard engine in any Cutlass after the 1972 W30 (Joe please confirm this for me ), even for a 442.

As far as if it's a 442 engine, it really wouldn't matter in 1975 because AFAIK there was no difference for any 350 in 1975. All of them had a catalytic converter so there was no "true" dual exhaust any more soo....

 

Depending on how you define "standard", 1971 was the last time the 455 was standard in the 442. The 1972 cars demoted the 442 package to an appearance and handling package available on most 2dr Cutlass models, but the engine selection was not part of the package. Yes, the W-30 option included the L-77 455 motor, but the W-30 was not a separate model, just an option package itself.

Even in 1970, the "442 motor" wasn't exactly exclusive to the 442, as the 365 HP 455 that was the base motor in the 442 that year was also the W-32 motor in the Cutlass Supreme SX.