Will a 1994 3.1 engine work in 1996 old cutlass?

The answer is probably yes, but it depends on a few factors. Both the 1994 and 1996 Oldsmobile Cutlasses likely used the same generation of 3.1L V6 engine. However, there might be minor differences in the engine's accessories (alternator, power steering pump, etc.) and computer programming.

Here's what to consider:

* Engine Code: The most important thing is to check the engine codes on both engines. If the codes are identical or very similar, the swap should be relatively straightforward. Different engine codes indicate different internal components or calibrations.

* Wiring Harness and Computer: You'll likely need to use the wiring harness and computer from the 1996 Cutlass. The 1994 engine's computer might not be compatible with the 1996 car's systems.

* Accessories: The accessories (alternator, A/C compressor, etc.) might bolt up, but you should double-check that they are compatible.

* Mounting Points: The engine mounts should be compatible, but it's always a good idea to confirm.

In summary: While it's *likely* a direct swap, it's crucial to verify engine codes and plan on using the 1996 car's wiring harness and computer. Otherwise, you might run into compatibility issues that require significant modifications. Consulting a repair manual for both the 1994 and 1996 Cutlass would be extremely helpful.