[G.M.]

They sit up against the tubes from the radiator tank. The purpose is to hold them
in place. Mounted lower in the hose they will be pushed up as the hoses expand
and from water flow. These stats have pre flow holes and some water flows on
start up. As the water gets to 180 if that's what the stats are they them move
to keep the temperature at 180 or what ever the stats are. Shewman's stats have
a larger flow opening than other stats plus the pre flow holes and provide more
coolant flow than other modern stats with small flow openings that reduce the
flow. The high volumn flow is important in hot weather, in cooler weather you
don't have over heating problems. You have to remember stats have nothing to
do with cooling they only raise the temperature in the engine. G.M.