The 7M's head bolts are not TTY. They are reusable (but the age of them is why I recommend replacing them). The fasteners were never the problem.
Pro tip: Toyota's service manuals do specify which fasteners are single use and which are one use only. In the MKIII TSRM it's just an asterisk by the fastener in the exploded diagram with a note at the bottom. A few are noted in the text too.
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