I've got a 50min connection on a PDX-LAX-JFK(-LHR) route.

Theoretical gates would be 52G over to 46C, or similar (that's based on today's flights), and I believe the terminal walk should be, say, 15mins?

Ought to be ok assuming no delays? If there is, I'm banking on a LAX-LHR replacement being offered departing the same evening, so it's not the end of the world.