ok? i guarantee it was not through a stalled non lock up automatic which is what this thing will be if they are wanting to make it fast.. sbc and LT1 heads arent the same. stock sbc heads are usually quite crappy in comparison of flow..the example i gave him was a budget build typical setup, saying 550 at less then 10psi was more for a visual that there would be alot of potential for growth later down and the turbo would still be rather efficient.