What the different? Are they same size?
Because I'm thinking putting the 2.3l aftermarket header on the 2.5l.

 

They are the same the 2.3 and 2.5 share the same head, block, crank ect. The only difference is the bore and stroke.

 

I know this is an old thread but I have to say something. The bore is the same between the two. The main difference is the crank and stroke. And thats not getting into the port differences in the heads and intake manifolds. Or the main journal sizes.