Special break-in oil for my LS7?

[71RS/SS396]

John, We run the engines on the dyno to break them in with Gibbs or Brad Penn break in oil, we then drain it, cut the filter open to check for any nasty chunks, then leak it down, if all is good on the leak down then we ship it and recommend Mobil 1 5w-30. Kurt doesn't seem to be too particular about any one brand of oil.