1972 Dodge Colt
FOUND IT!
Like Derek Bieri on Vice Grip Garage, "Well, I'll be dipped!"
PO of the head milled all the rocker supports flush.
He told me, be sure to Blue Loctite all the bolts holding the aluminum rocker supports.
Well I didn't associate Blue Loctite with water sealing.
This picture shows the number one rocker arm bolt visible through the thermostat boss on the head.
This is in the head waterjacket.
Well that would explain the milkshake machine.