Denny likely has the Machinist's Practical Guide handy, believe him .... but note that the American Standard specs for classes of fit changed in 1949, a bit after a manual from 1943
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics
