Looking at the head, bolts are:
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-6-------1-------3-------7-
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-8-------4-------2-------5-
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-Tighten in sequence to 37ft-lb.
-Using angle torque meter, rotate additional 130 degrees.
Be sure to use new head bolts. They stretch during install and will not re-torque properly. If you're looking for a reusable head-mounting method, go with head studs.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne