[Barronviper1]

Hey guys, Im new to the club and I'm currently deployed in Iraq. But my question is...Are older model 2.4L engines compatible with our scion engine. I noticed they have the same displacement but I dont know if the internals are different. I want to buy a cylinder head online but only older model toyota heads show up. Im planning on working on the cylinder head I purchase and once I do all the valvetrain work its going on the scion. I've worked alot with mitsu's and I just started with toyo's so I'm still learning about whats interchaneable.