Its not the style its the casting. I went cheap and bought the Patriot perf heads..... Well after bolting them down to the motor twice mine developed stress cracks just below the spark plug holes above the bottom bolt holes..... Patriot prob would of warrantied them but they would not cover the money I had in the extensive porting that was done when we welded them back up. I took them to one of the best in the country with welding/fixing alum heads and they still didn't hold. The material just wasn't good enough. In the end the crack ended up taking out the #6 piston b/c it cracked down into the cylinder and washed it down.....
Moral of the story, u get what u pay for..... The ported said the castings were real cheap (very similar to pro comps) and thats what they were supposed to be. Next time, I'll save and pony up for a quality set (afr, trick flow, etc)