A local engine shop here charges something like $300 to break down the head, clean, and resurface. Not bad.
Unless the engine is a pain to work with in the bay, I don't see why the quotes are so high. 4.6 with the cam in the heads, yeah. 302? No.
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'13 Mustang 3.7V6 - MT82
'00 GP SE (L67 Swap, XP, Headers, 3.25")
'98 GTP, '01 Bonne