Nigel, they are Holden Australia surplus engines.
See here on the LS1 forums from Holmart:
http://www.ls1.com.au/forum/showthre...&highlight=L76
Blair, HONG KONG!!!! been there, done that, read the book, seen the movie, worn the T-shirt. I love the place.
Before ya go.....make an appointment to see your GP, get some anti-biotics.