Make sure you use the factory gasket from the original LS thermostat. The gasket supplied with the 160 thermostat is too small for the thermostat housing. It can and will leak if you don't replace the gasket. What baffles me is the fact that Mr. Gasket and Motorad (same thermostat) designed the thermostat and supplied a gasket that is slightly smaller than the factory gasket. Big failure.
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