If you do swap to the "common" 6.0L #317 cyl heads and are planning on boosting it, DO NOT mill them down to raise your compression
The 317 heads have very similar intake and exhaust runners as the "LS6" #243 / and #799 cyl heads with D shaped exhaust ports
The big difference is the combustion chamber volume:
#243/799 cyl. heads - 64.5cc
#317 cyl. heads - 71cc
You should have a cam "spec'd" for you by a reputable professional ( ie Pat G or SpinMonster) and/or find someone with the same build that did
The cam is basically the "brain" of the engine, so you want what is going to work for your given application (vehicle specs), driving intentions, etc
If and when you get to that point, I usually have sets of the #317 heads and LS6 intakes (both bare and complete with rails and injectors)
As mentioned before, use the LS9 head gaskets and ARP studs
You have to decide exactly what you want to do, then buy your parts, since most are going to be specific to the "type" of build that you do (ie. N/A, Boost, nitrous, etc)
You will be fine with the stock TB, should have it ported and polished (again, by a professional) any larger TB would be a waste, since the TB opening on the LS6 is the same size, unless you setup to a FAST intake 90-92mm for approx. more than double the cost of a used LS6 intake without "double" the hp gains
Hope this helps, Jeff
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