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Message: <blockquote data-quote="glittle75" data-source="post: 545957" data-attributes="member: 8675">these ar "interference" engines. tolerances are really tight. no one makes them because of the cost of R&D, testing, and everything else. I think if the trick flows do ever come out, they will boost the market and we might see a couple other big names making heads. but the first company to do it has a big risk involved. spending heaps of money to develope a head that could fail miserably, or R&D to find out that you cant improve on the stock design, and keep it priced for the average guy. if the TFS heads are as good as advertised (and really, what is these days) then they stand to make alot of money on a head that can flow just as well as-cast, as heads that have been hogged-out in port work. then can be ported to 4v numbers. but if its all just smoke and hype, and the TFS heads are 2k a set for a 5hp increase, they will lose everything because no one will buy.</blockquote>