400rwhp is easy these days. Back in the early days of the LS, 400 was the magic number. That was 1999. Now a heads/cam is in the 425-475 range typically. Sleepers can go in the 400-up area. We did one a few years back that had to look and sound stock. He made 392rwhp through manifolds and an automatic. His wife did'nt even know that anything was different. He said the extra hp was from a tune
