Im looking to find out if the GM LS2 will fit into my 2004 impala, iv been looking and asking everywhere but no one can give me a solid answer of a yes or no.
No. 2004 W-body chassis is transverse FWD drivetrain. You need an LS4 which will have the proper engine mount bosses and accessory drive attachment points for a V8 FWD W-body engine cradle found in V8-equipped 2005 - 2008 Grand Prix, 2006 -2007 Monte Carlo, 2006-2009 impala, and 2008 - 2009 LaCrosse. Also the LS4 has a special unique shortened crank shaft to allow V8 to fit transversely in W-body chassis. It would probably be easier to just buy a 2006 to 2009 impala SS which is already fitted with what you want including accessories, wiring harness, computer,4T65HD transmission, heavy duty half shafts, etc.