LS rods are weaker than VTEC rods b/c they are built to withstand much lower engine speeds. As far as the stress boost would cause even if you kept the lower redline of the LS engine I'm not too sure. I'm sure someone can tell you. I would definately do what BTEC suggested and at the very least go with ARP rod bolts AND head studs with boost. I wouldn't boost too much either, probably 8 lbs max. Again, Im no expert nor do I have much experience with boost but that would be my view on it if I were doing it.