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Re: 90 Lumina 2.5 to 3.1 engine swap? Anyone done it?
The engine will bolt up to the trans, but the torque converter is different on a 2.5 than a 3.1. You cannot use the existing wiring harness, because you only have 4 injector plugs, V-6's need 6. Bare minimum, you would need a compete wiring harness, ECM and the motor mounts from the donor car to do the swap. As others said, there is a myriad of little parts that will frustrate you until the conversion is done, which make it unworthy of doing in my opinion.
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