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Did a LS6 intake swap on a 2000 LS1 a few months ago. Just use the LS6 rear coolant block offs and the
front coolant cross over tube.
Russ Kemp
Thats what I did when I installed the LS6 intake manifold on my '00 coupe last year. You won't see the tubes until you have the intake manifold removed. There are those, who grind the ribs off the bottom of the LS6 intake manifold, instead of getting the LS6 block off and coolant tube kit. Personally, I just didn't feel good about grinding on the intake. I'll bet Gene Culley, a supporting vendor, has a good price.