.... I can tell you to definately go with a reputable shop, but even then you can't tell.
I understand why your are "a bit fussy"!!
When I bought the head, I thought engnbldr was as "reputable" as I could get. But apparently it was a fubar'd head!! I'm guessing it came for a Chinese source with OS valves installed and never checked, just boxed and shipped to me.
Gnarls.
