These are off my LS1 (2000) with approx 50k miles on the heads... I am going to LS6 heads. They come assembled with Dual PRC valve springs and titanium retainers with approx 15k miles. $175 shipped.
Thanks for looking
-Bill
http://www.pittspeed.com/uploaded/LS1SB241s (5).JPG
http://www.pittspeed.com/uploaded/LS1SB241s (6).JPG
http://www.pittspeed.com/uploaded/LS1SB241s (7).JPG
http://www.pittspeed.com/uploaded/LS1SB241s (8).JPG
http://www.pittspeed.com/uploaded/LS1SB241s (9).JPG
http://www.pittspeed.com/uploaded/LS1SB241s (10).JPG
http://www.pittspeed.com/uploaded/LS1SB241s (11).JPG