with an ebay twin turbo kit on 118 rockett brand it made more than 1200 hp at the crank. best part about it was they ran it 60 pulls in that configuration and it didnt blow...
btw....it wasnt a 5.3....they thought it was but when they pulled the heads and ran the casting numbers it came back as a 4.8!!
http://www.hotrod.com/techarticles/h...g_bang_theory/