Fellow Rotarians:
I've come to the point where I need to set up the expansion / overflow
system.
My engine guy is saying I can just have an overflow reservoir since the
pressure cap is at the top of the engine. I've read that some 13B flyers (if
not all) have expansion chambers which, in turn, have their own overflow
reservoirs.

My understanding of a reservoir is a bottle that holds excess coolant which
is expelled from the pressure cap. The coolant is then sucked back in as the
fluid cools. An expansion chamber is a pressurized bottle, usually made of
aluminum. I beleive it should be 1.5 qts or more.

Could someone please correct my understanding where wrong, discuss the pros
and cons of these systems for our purposes, and point me in the right
direction for obtaining / constructing the parts I need?
Regards,
John Slade