@ NathR

You didn't by any chance try to remove these bolts while the engine was still hot did ya? As the bolts expand and proper weld themselves in the thread. I'd know, as I snapped 2 bolts on the flange when I fitted my manifold....oops!

Went through 2 very expensive drill bits to get them out, then went and bought proper, non-ford bolts from a iron works place for £3.50, with proper bolt type tops, not the stupid allen key jobbies!

If you need a set, let me know, much easier to tighten these bolts down, as their the normal kind...