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Can a 3100 V6 out of 95 Grand Prix fit into 91 AM?

No, a 3100 V6 from a 1995 Pontiac Grand Prix will not fit into a 1991 Pontiac Grand Am without significant modifications, and likely not even then. The engine bays, mounting points, and ancillary components are too different. While both are GM vehicles and use V6 engines, the generations and platforms are distinct enough to make this swap impractical.