first off is the crank the same for the 2.2, 2.4 and the 2.0? also i was wondering what the differance was between the connecting rods and pistons for a 2.2 comapared to a 2.0? as far as i can tell the only differance between them is the location of the wrist pin and the piston height.

 

Page 83 of the build book appendix has all the details:
http://tunersource.gmblogs.com/Racer...06appendix.pdf

 

all the cranks would have to be different in order for the engines to have the different strokes they do. Rods would also have different lengths. Wrist pin locations and piston height, like you said, are different amongst engines. Also, 2.2 rods are weaker than 2.0 and 2.4 rods in strength. 2.4 rods are cast differently (theyre stronger), and i believe 2.0 rods are forged. None of these parts are interchangeable unless you make a custom part to compliment them.