Do cylinders 1 & 2 on a 340 usually run a bit cooler?

Would not surprise if the two front cylinders run cooler. After all, they are the first cyls to get coolant after the coolant has been cooled by the rad. The chambers of #1 & 2 you would expect to be hotter, because they bet the bulk of the coolant that has passed through the engine & picked up heat before arriving at 1 & 2 chambers.