If your engine has the one piece, cast aluminum outlet housing, the balanced flow series thermostats we have in the online store will not work. That housing takes a stand-alone thermostat that is sealed with an "o" ring.
If you have the two piece housing system, our 370-series thermostats will work. You will also need two gaskets. I run 195*f thermostats in all my ihc-produced engines including the 152 and 196 engines.