My concern would be flow numbers then price then origin. From all I've seen and heard of the Eddy copies are decent quality castings. Most have said valve seats aren't the greatest of quality but can be fixed. I'm a racer and we really don't have a "cheap" option like the bowtie and furd guys. If someone would put out a reasonably priced ported standard head they would sell thousands of sets. And without saying any names the current heads with outstanding #'s that no one can achieve are unattainable. No matter how many emails and phone calls I put in. And IMO those heads aren't reasonably priced either. These heads should be priced @ less than 2K. Then add options like Roller springs, titanium retainers, hollow stem valves. Because if your gonna spend $3000-$3500 why not buy Indy or W series? All this said I own Eddy heads and I do like to buy American but that's just not in my budget.