i know that all you need is the rods and crank out of a 5.3 but has anyone actually done this swap? i know there is one guy on here attempting this right now but is there anyone else? im going to be putting in a cam soon and its good to switch out the pushrods anyway, so i might as well do the crank to and have a 5.3

 

correct me if im wrong... but arent the pistons different also? dished (5.3) vs. flat-top (4.8)? dont think that would cause any "issues", maybe a little higher comp. ratio... but all in all, is all the work gonna really be worth the torque gain?

 

Why not send the block to be bored and put the ls1 rotating assy in? 5.7 sounds better!