[Stefano]

1970 Oldsmobile Cutlass S, W-31, 4 speed.

Here is an example of a car, where’in the originality of the car can be used to authenticate the car beyond any reasonable doubt. (I’ll share the details).

So many of the cars for sale / recently sold do not have the provenance to establish authenticity . I am aware of many collectors who acquired W-31s for their collections only to later discover they had purchased faked up cars.

The Key external bolt / paint on components / stripes can be added to just about any non a/c, non power disk brake Cutlass / F85 and you have a car which looks just like a W-31.

Just like many other muscle cars, 4 speeds were not as likely as the automatics to have retained their original engines and not many examples exist today with both documentation and original engines.

1970 W-31 Production numbers:

1,029 Cutlass S Holiday coupes like this one.

116 Cutlass Sport Coupes.

207 F85 Sport Coupes

1,352 W-31 in total produced for the 1970 Model year in both 4 speed and automatic are the generally accepted numbers.

The 350ci engine was rated at 325hp and 360tq and was quite a performer.