Mazda Miata: nasty sound in upper part of engine

hopefully I haven't done something real stupid. Friday I drove the miata to
work, took it into town in the heat of the day, ran great. Parked it and
left it an hour or two, started it and it had a real nasty sound that seemed
to be coming from the cam area. Like things were running dry or something
was loose. I shut it off and checked the oil level (about 3200 miles since
changed last) and it was about half a quart low. Not a problem but on the
other hand, I usually start getting some of the typ valvetrain clatter
around 3k. Anyway, this was worse but not terrible, I decided to limp the
car home (20 miles or so). I took side streets and kept the revs to 2000,
2500 at tops (I felt like Lanny when he tried to see what the max mpg might
be on his miata). It was nerve racking but I kept putting the window down at
stop lights, and I wasn't hearing it. Got it home and I'm not hearing it.
Started it today let it warm up just a bit and reved it to 5k, 6k and seems
fine.

My question; could something have been blocking an oil passageway and have
since freed itself? Anyway I can check this out better or should I just do
the oil change and take my chances?

Chris
92BB&T w/ 125k

OK, I give up, what does that do that makes the clatter go away? Not saying
it doesn't work, but why does it work and what is it doing? You're not
saying the repairs take a month or so are you? ;-)
Hank J

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