Hmmmm... Check out this stuff from the LS1 Holden forum
http://www.ls1.com.au/forum/showthread.php?threadid=17187
http://www.ls1.com.au/forum/showthread.php?threadid=16966
http://www.ls1.com.au/forum/showthread.php?threadid=17187
http://www.ls1.com.au/forum/showthread.php?threadid=16966