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2007 and up I believe.

Its the 6.2 L head, casting number is 823, theyre square port and flow better, you have to change intakes, and sometimes ptv can be an issue.

my new setup is a 6.0 l92 heads 230s cam 630s lift, single plane intake 90mm TB and 3600 stall, should do good. Id say to wait and see but its gonna be awhile :lol: