Do I need different injector clips when I throw in my 42lb ones? I had heard I might need LS1 clips verses the ones for my 5.3. Please help.

 

Are you talking clips, or connectors? If they are Multec II Bosch injectors, your connectors will work. The clips should work whichever injector you use. My stock clips worked on my 60lbr's. Of course, I had to change connectors.