if its a repost.... go away repost police.. you will never catch me. http://www.gmperformanceparts.com/HomeHighlights/build_it.jsp with the zz4 350 i made 423hp @6000rpm and 409tq @5000rpm with the 383 i made 436hp @5750rpm and 452tq @3750rpm not a good sellection of parts.. the cam on the 383 was to small for the heads... it made the most hp/tq with the single plane manifold. the dual plane killed the numbers. do you think these numbers are correct? the ls motors make over 600hp.. i havnt found the best combo yet.