where to measure 273 ring gap in cylinder bore

Ironracer said
Gotta be... that's crazy. Is that a FSM, or one of them crazy parts store books? I've ran into bad info with the latter...

The fsm I down loaded from the internet. It uses that spec in a couple different places in the manual and for all engins 273-383. Seems like it would be an error to me or I’m reading it incorrectly, which is very possible