GM did a build tech session with the Ecotec 2.0L LSJ.. The released documents were on a GM performance division server, but only Part one now remains there.

Here is part 1 >   CLICK HERE <

Part 2  >  CLICK HERE  <

Part 3  >  CLICK HERE  <

Part 4   > CLICK HERE  <

Dyno sheet from part 4 making 300+ HP