It’s been discussed to death on these forums so using search and spending a little time reading those threads should answer your question. Or use Castro’s own site to recommend the best oil, which is Edge 5W30 A3/A4 for your LS1.
In any case the owners handbook would specify the recommended grade of oil (I thought it was in the 15W40 viscosity range).
Would i be using 0W40 oil, no as it’s too thin and would impact (lower) oil pressure in older engine designs (with wider clearances)...