How about swapping fuel injectors to see if the knock follows? You could have a stuck open, clogged, or failing injector. It definitely a long shot, but quick and easy compared to pulling the head.
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2007 C6 z51 416ci, KW variant III, Wilwood WS6, Traqmate.
2005 F-350 PSD 4x4 DRW Lariat
2013 Mustang GT Grabber Blue, track pack, Brembo, Recaro, 3.73s
2009 Jetta Auto 2.5 liter
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