~9300 rpm @ ~36 psi. More than either of those numbers and you need duel Ferrea.
Alright pansies, the stock rev limit is somewhere around 7350-7400. With my AEM, tuned by John Reed, my rev limit is set at 8K on a bone stock long block. You have to realize that manufacterers set the particular limit based on warranties and longevity of their products. Don't know if you know this, but my warranty is up. So botom line, with the stock spring tension and turning up the wick a little, my stock springs don't start to float up to 8k. If you are to go out and buy some high performance aftermarket springs that you feel can't rev farther then stock, then you are wasting your money and have been bench racing all your life. The Crowers are good up to 9k+, dual springs 10+ but there are other limiting factors that won't let you go past that and not the springs.