noise from 4a engine

["Valerie Stabenow" <hlub34a@aeroinc.net>]

My 1967 4a has decided to put out a new noise. It's coming from the
engine compt. I had my stethoscope on it today and heard nothing from
the block.

It is noticeable at fully warmed idle and is not a knocking noise with
a regular cadence, though it does sound like a knock. It disappears
with increased engine speed. Could this be a water pump?? (oh please)

TIA,

Valerie