If I have a 3800 series engine in a 2002 grand prix 2 door will it fit in a grand prix of a different year and a 4 door or a totally different body style?
As long as both vehicles have the eighth character of the vehicle identification number "K" you should be ok. Just compare the mounting of the accessories, wiring harnesses, and things like that. Grand Prix used the same body style from 1997 thru 2003. HTH. -Jim