Just spotted these on E Bay wondered if anybody knows anything about them, it says they're the same as Dart heads? http://www.ebay.co.uk/itm/Small-Block-Chevy-loaded-V-8-Cylinder-Heads-SBC-350-327-210cc-straight-plug-/161840014198?hash=item25ae6aa376:g:qGwAAOSwFnFWB~n5 

I would find out where they where made. If they are Chinese castings I wouldn't take my chances. 

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GEN III 5.7L "LS6" Engine swap
TKO500 5 spd.

My thoughts exactly, was just wondering if anyone had given them a try, my guess is they're Chinese copies.

 If they say Like Dart heads, I would think Chinese. I talked to a local machine and they have had people come in with chinese heads and they won't touch them. They said they'll warp and had some come there in 2 pieces. Look at the type of aluminum the heads are made from and do a lot of research. You get what you pay for. I have a set of Pro-Filers that work great, priced reasonable, and the people were easy to work with. Look for made in U S A