Hey trying to do a swap, still having problems on which motor im going with though, cant make up my mind if i want a ls1 a lq9 or w/e the hell else i can think of, i really want a 6.0 all aluminum block, anyways my truck is an 03 sierra, and i wanted to know if they had started sealing the knock sensors up the right way in 03 or not? cause the truck has 82k on it now and im feeling like im going to have to replace them and its gonna **** me off, any ideas? and an imput on which engine i should go with would be nice too, like which is the cheaper route? which is for the better dd? u kno the usual stuff. thanks guys