After GM finished making the 3800 engines, the other engines that replaced them were absolute garbage. In order to keep these engines running as long as possible and keep the Head Gaskets and transmissions from running forever it is wise to keep the engine as cool as possible, but still have ...

Replacing Thermostats with 160 degree and lowering the radiator cap to 4 pounds may make the intake manifold gaskets last longer. If you look at Rockauto.com and look at an older year of vehicle you will find a Motorad Thermostat 160 degree thermostat that should work.