> Valve setting effects compression.
That is true. But I question the value of doing a compression check before
a tune-up anyway, when working on your own car for the street. It's
different when you are getting paid for your work, and don't know the car
well; or the engine is for a race car where every last hp is sacred. But
for a street engine, you don't refuse to do a tune-up just because it is a
bit tired.
I've run a lot of miles (and even won races) with engines where the
compression was significantly down on one or more cylinders.
-- Randall
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