The head bolts are smaller than the 7.3. But the issue is that the are designed to stretch when torqued down. It helps hold the gasket over the life of the motor (it was supposed to), but with more boost and cylinder pressure they will stretch more resulting in blown head gaskets.
It's a non issue for trucks that are not modified. That however is no fun. 
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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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