Follow-up: first-generation Mercury Cougar. Dad may have misremembered (or his friend may have exaggerated) the fender hatch thing. I haven't been able to find any reference to that fix online, only a lot of people bitching about having to undo motor mounts and partially lift the engine, or train a small howler monkey to go in there and change the plugs.

--G.
ok, maybe not the monkey part

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