we have tested several vortech style centrifugal style blowers with mixed results, fact is the ls1 runs 10.5:1 compression which is pretty high to begin with so unless you start changing to lower compression pistons which ups the cost considerably, forced induction seems much more involved than a cam in terms of bang for your dollar,also i didn't realise the heads on the ls1 are so amazing, they can flow close to 500hp stock and if anything only need a good set of valve springs to compliment the higher lift cam.