Stock for Stock the LS6 heads flow quite a bit better, but have a little bit bigger combustion chamber so you would lose a little bit of compression. I would say you would gain more in flow than you would lose in compression though. Plus you could always deck the heads some to get your compression back. I do believe a lot (if not all) LS6 heads came with sodium filled valves as well. Just make sure the heads have 243 stamped on them or they are not LS6.
As far as the intake goes the throttle body bolts on with all the sensors. The map sensor should work off the truck intake as well, but you may have to grind one side smooth to snap into the LS6 intake.
Hands down both would be worth upgrading too.
edit: I did forget to add, the truck intake flows about the same as a LS6 intake down low, but up top around 5000 rpms, I believe is where the LS6 takes over.
Last edited by Fitz78ta; 09-21-2010 at 11:57 AM.
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