Right now there are a lot of options out there and most shops using GM based cores are giving them away. The AFR is a good piece, especially on relatively mild combos they really shine due to their smaller runner cross-section which help their power curve, but factoring their cost....There are several new heads out/coming out that will reset the standard for aftermarket LS heads. So in my honest opinion..If you're on a budget, a factory casting done properly is hard to beat. But if money is no object, and you're looking for lower RPM power, I'd go AFR...But if you're trying to build a "killer"...I'd get some of the new castings from someone like All-Pro/Callies etc...JMO

Felber