1983 Chevy 305 diagram, waterneck, thermostat housing and fittings
the thermostat is in the coolant cap
connected to thermostat housing
Take it to a Chevy dealership.
Remove the water supply hose from your 1992 Chevy thermostat housing. Remove the thermostat housing retaining bolts. The thermostat can be lifted out. Reverse the process to install the new thermostat.
You can replace the thermostat on your 2010 Chevy Impala 3.5 by removing the water hose and the 3 bolts from the thermostat housing. The thermostat will come right out. Reverse the process to install the new thermostat.
The only one I can think of is the exhaust Y-pipe may not fit from the 305 to the 350.
It's in the housing connected to your upper radiator hose.
you blow it up
Follow the top radiator hose down to the water outlet; your stat is in there.
To remove the heads on a 305 Chevy, first disconnect the battery, carb and throttle cables. Also disconnect the sensors and vacuum hoses. Unplug water temp gauge sensor on the thermostat and disconnect pump from brackets.
It's usually screwed into the intake manifold towards the front, near the thermostat housing.