3208 thermostat housing removal, How do you get the dang thing off.

[jim matus]

I just rebuilt my fan assy.,and the water pump belt idler so I figured
I would change the thermostats while I was in the front. I took out the
3 bolts but there are 2 studs w/nuts that won't come out. The stud
turns with the nut but doesn't back out. I have the Cat shop manual and
it shows a different water neck. Is the 180 degree neck a Blue bird
Item?
Are the studs really bolts put in from the backside of the thermostat
housing before it is installed? I don't want to damage the casting and
I don't know if I need to split the nuts on the studs or what. Also if
anyone wants to rebuild their idler assy. I can give you the Cat part#s
for the parts you need. About $40.00 worth of parts instead of $375.00
for a new idler assy.Thanks Jim Matus 1984FC35SB Rescue CA