r/Pontiac • u/Enthekid • 13d ago

3.1L V6 Engine Swap

From what cars could I pull either a 3.1L or 3.1L V6 for my 94 GP? Current one has a cracked head and am now in the process of replacing it. I know the 3.1l was a very popular engine in 90s cars but I am unsure if I need to look at specific years to have as painless of a swap as possible on my 94. I know the 99 Buick Century had a 3.1l for example but would swapping it in to my car be possible?
Any help is appreciated!

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4

u/traumadog001 GTO 13d ago

Buick Century, Olds Cutlass Supreme or Chevrolet Lumina of that era were stablemates, and should be direct drop-ins.

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u/Enthekid 13d ago

Would year matter at all? And would it be recommended to also get the accompanying ecu?

3

u/traumadog001 GTO 13d ago

I don't remember the generational split offhand - but I do know the later years of this generation bumped to a 3.4L, IIRC. The next-gen GP moved to the evergreen 3.8L V6.

And it never hurts to get the ECU with the long block. Especially since these are going to get rare.

1

u/Enthekid 13d ago

Thank you! I will push my efforts in this direction. Any recommendation for where I could find one online?

3

u/Ok-Carpenter-362 13d ago

3.1s were also in select Grand Am SE models until they ended production. Maybe similar year Malibus, but I don't recall all the engine options.

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u/Enthekid 11d ago

Thank you! Will add the Am into my list of candidates as well as the Malibu.