All else equal, yes

 

Yes it has bigger cubes and produces less boost.. thats why magnuson came out with the 2300 for the larger 6.2.. your 5.3 might make 12 psi with the tvs 1900, then you swap the 1900 to a 6.0 and it might make 8-9 psi then you put it on a 6.2 and it might max out at 6-7 psi.. bigger cubes produce lower boost unless you spin the maggie faster.. but superchargers have a rpm limit just like engines do.

 

I'm running an LQ4,L92's 1-7/8 ARH, water/meth mix, 8 rib with the 2.7 and im reading 13lbs

 

To get more boost I can get a 10% overdrive crank pulley, smaller s/c pulley