heater valve quick ques...

["Peter Laurinaitis" <laurin212@yahoo.com>]

quick ques - i just received a new heater valve (mark 1a style), but noticed
when the valve is in the wide open position, the internal rubber stopper (the
actual internal rubber plug component that blocks the coolant flow) only
appears to open enough to clear half the internal channel or flow path ...
does anyone have a spare valve around to check if this is the way these are
designed, or may i have received a defective one?  in upstate new york, i want
to be sure my heater works at full capability!

thanks,
peter