Toilet install - should I level the flange

[Hookmaster]

It is in the basement. The cast iron stub was cut off and ground down to be level with the cement. With the flange pushed all the way down, the outside edges aren't touching the cement. Should I level the flange before I tighten down the Tapcons?

[Archerysniper]

If the flange is not level or not on the concrete you will need to use shims to make the toilet set correctly. you might have to chip out the concrete a bit and grind the pipe down to get the flange to set flush with the floor.

[Surface Tension]

What Archerysniper said.

A flange set too high along with a stool that rocks is what you want to avoid.

If you can eliminate both your not going to have problems

Do what you have to do to get support under the flange and that being closest to floor level is what your trying for.

Grinding the high spots being the first choice and keep in mind your stool is going to set on it so the area around it should be close to the same level. After taking off the high spots and it ends up you have to grout under the flange then so be it. End result with stool set its best to not have to use shims around the base but OK if you have to.