hi can anyone tell what if any changes between 42s and 43s and is it poss to upgrade my 42s i am informed that the block and head are the same but injector and pump same bodys but diff settings and if i ordered a engine rebuild kit for my 42s i would be given a 43 kit! is there any power gains or cooler running gains to be had from upgrade?? has any one done this?? why volvo made 43s any why same block etc??