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Is there any interchangable parts between the Grand Prix supercharged or not and the Grand am v6’s. More so the injectors and the supercharger itself and the transmission to push more power and withstand it. (I own a 2005 v6 3400 sfi grand am SE)

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Sadly no. The reason being is that the 3800 SC engine from the Grand Prix is 90 degree engine design based on the Buick V6 oddfire/evenfire/Grand National/GSX motor. The  LA1 engine that you have in your Grand Am is a 60 degree engine design from Chevrolet, that started with the LE2 engine back in 1980. These are essentially different engine families.

The transmission may bolt up to the 3800 bell housing, but the 3.8L SC engine will be a tad wider than your 3.4L motor. This is not to say it won't fit in the engine bay, but you will have to do all the custom fabrication since there is no kit that I am aware of, for this swap.

 

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