I'd be curious to know if the Chinese even assemble and dyno test their own knockoffs. If they spent the time to build a better mousetrap it may be a different story. But I can see it another way too: if Edelbrock sells 100 sets of heads and 1 has a problem, people rant about it. If Skip White sells 1000 Chinese knockoffs and 100+ have problems, everybody seems to think "oh well, that's why they're cheap." So moral is the majority of people don't mind paying for crap as long as its cheap. Even the big companies can have problems-but, when they do they really should take care of the customer about it. Back in the day, I worked in high perf. retail and a customer brought in a set of RPM Performer heads he just bought from the shop. One bank would nearly overheat it got so hot. Know what we found it them? You could clearly see a ton of aluminum slag in one of the cooling passages! We sent them in to Edelbrock, and they ultimately (no questions asked) reimbursed the customer everything including dyno charges to reassemble his engine. He just had to submit receipts. Yeah a pita but they came through as best they could once they seen it was their fault.