Anyone have info about theese valve covers?

[GNX423]

http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&rd=1&item=4559988933&sspagename=ADME%3AL%3ARTQ%3AUS%3A1

Im looking for a set to clear roller rockers, any one know if they are taller then stock?
Thanks,
Mike