Why is that? If it is based on that edge having a bevel, this door doesn't. I looked into that beforfe purchase. it is a masonite interior door from Home Depot. The website description doesn't say anything about a bevel and both sides measure the same (though I am not sure a 2-degree bevel would make a difference measurable with a tape). This door also comes with the lockset bores so trimming that side would not be my first choice.... you never trim the hinge side, always the latch side.
Using my speed square as a depth gauge, it looks like the door jamb has a slight bevel (widening away from the stop). Is that something that might have been done in 1951? That seems like it would be a lot more difficult than beveling the door.The latch side needs to be beveled, to remove the material that is in the way, without creating a huge gap when the door shuts.
Mine is a Masonite slab with lockset bores and mortise already done so I am reluctant to trim anything from that side. Still, if my calculation is correct, trimming only enough for a 2-degree bevel means a cut depth of 3/64 (rounded up) from the side that will hit the stop. If I do trim just enough for the bevel. That is pretty precise work by any method but the table saw seems like my best shot at doing it accurately and that also lets me use a zero clearance insert to minimize tear-out.Pre-hung doors come with a bevel, slab doors usually do not, in my experience.
Replacing the frame (presumably sized for a 32 inch slab door) seems like overkill. I took 3/16 off the hinge side and a "dry fit" seems like it will work. I am going to paint the whole thing before making the hinge mortises so it will probably be Wednesday before I try hanging it.Just trim the hinge side of the door, you do NOT need a new frame. I always put a bevel on the hinge side also, so they won't become hinge bound. There is plenty of solid wood in the door edge to trim the 1/4" off.
This is a great idea. However, in this case the frame is already mortised for the old hinges.I used no-mortise hinges throughout my house. I noticed that my retired master builder friend used them (at least on his pantry door) in his $1.6 million house. They give just the right amount of hinge side clearance.