My heater core is hot to the touch that I remove my finger after 2-3secs normal?

I reasently replaced my thermostat and hose going to my thermostat. My heater core is hot to touch and I'm wondering if it's normal on a 91 Ford ranger 3.0 v6 manual? There are no leaks on passenger side

Normal it is about 180 deg or higher

You can touch the heater core? Must have long skinny hands…