Remember this...you still get what you pay for. If they are lots cheaper than other popular brands, there is a reason. And almost 100% of the time, it's because they're poor quality. I have seen the same thing with Pro-Topline heads...cheaper, yes...but the castings that I have seen are poor quality. Might be the same with these. If you could cast a lower cost head (or any part), all the guys would be doing it. The good ones cost more because they are better. Maybe you can make the cheaper ones flow better with port work, machine work, etc...but why should you have to do that? Spend a little more and enjoy the benefits.