i read on here before that it was better to run without a thermostat (gutted one) because it runs cooler and wont over heat.. i tried it on my SBC and yeah it does run cooler and takes forever to reach operating temp. never over heated, just wasnt able to get warmed up. cold engine = more wear. i dont see the point, so i installed a 180-190 stat and it stays constantly at 190 degrees after its warm wich doesnt take to long.
i will always run a thermostat now.
If you are going to run without one and have your car run cold and create more wear, the same time why not use some real cheap low grade no name motor oil