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Well, sometimes it's good to revive a zombie to remind people of simple matters rather than start new thread.
FWIW, it's not possible to tighten these engine-bolts to normal torque because it would break off mounting-ears on engine case and head (no spacer in between). Torque specified in manual is only 1/2 of standard torque for that size fastener, so it's possible for them to vibrate nut off over time.
Blue Loctite and star-lockwasher is all you need to keep them secure. Split-lockwashers have been proven to not be effective and no major OEM manufacturer uses them any more. Honda uses very nice belleville spring washers... especially on their SSSA applications.
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