Just a few simple questions, do I need to purchase a gasket(*) to change the T-stat. If so which major auto parts stores carry them and how much do they cost. I purchased a 180 stat from auto zone tonight and didnt even think about gaskets I wanna make sure I got what I need before I change it. Last summer my t-stat went in my cutlass and that damn thing was always around 230-240 so I want to do this mod before the hot summer gets here. Among the many things Ive changed on cars, I have yet to do a thermostat.

thanks

Ya you need gaskets. Make sure u also replace the round rubber gasket on the T stat.

i just purchased mine yesterday with the round rubber gasket and gallon of anti freeze. i have the silicone but it the a gasket for the houseing as well? the gasket im talking about it the gasket that matches the shape of the housing'* surroundings

On my car there is the o-ring that surrounds the t-stat, and a paper gasket between the gooseneck and the block.

That'* correct. You need them both. The paper gasket isn't supposed to need any other sealant, but I always put a SMALL bead of silicon gasket sealer (hi-temp) on both aluminum surfaces first. My aluminum LIM and Gooseneck have mild pitting from age.

If you're going to use silicon sealant, you really don't need the paper gasket.
Mine seals fine without one...just a light smear of silicone red.