Any question you guys might have concerning the flow of differnt heads pt# cams what year came with what intakes etc. This books has in it. I suggest you guys check it out it has answered a lot of my questions. Plus it isnt that expensive. "Chevy ls1/ls6 Performance"
http://www.autoink.com/HPHome.html

 

I know a few people that have it including myself. The author is a member of this site also. It is very good for the LS1/LS6. There is a lot of good info on the truck motors to. But it is focused on the LS1/LS6. About the only thing I have found a little misleading is the part where it says that the truck cranks will not interchange. I emailed Chris about it and he agreed that at the time of the gathering of information, that it may not have been as consise as he wanted. I'm guessing his info on the crank was based on the 99/00 6.0 block with the iron heads. I recommend this book to anyone also.