Grizzly handles TEFC motors, they say that a Nema 56 frame, 5/8" shaft fits
90% of the woodworking machines out there. I looked into upping the HP on my bandsaw once, never did get around to it. Maybe one day.
Frankly, I'm not sure upping the HP is not a good idea - regardless the blade(s) used. Of course no one would disagree with the premise that the right blade makes the job it's designed for easier on the tool and requires less HP to do it's job.
But folks I've known who have upped the HP of their BS all describe a significant difference and none have expressed regrets.
Unfortunately for me, by the time I got my (underpowered) 14" Delta BS, I had lost contact with those folks and found myself asking (on this list and others) for folks who had made the switch up to help me source a replacement.
I'm not sure why folks presume one asking for such information does not understand the "right blade for the job" rule, but I get a lot of that as well.
I did switch to a LINK BELT and noticed marginal improvement and less stalling. But have yet to take the motor off the saw and bring it into GRAINGER or equivalent to find a replacement built on the same frame, with the same RPM, that provides a rated 1.5HP and is designed for the intended use. I only hope the fellows at Grainger know more about AC motors than do I.
I went into Woodcraft here in Florida the other day and noticed the
14" BS they had for sale carried a 1 HP motor and asked for help. Off the top, they had no answers, but did try and find a motor supplier online and gave me a couple of sites and numbers to call.
The folks at Tractor Supply have motors on the shelf, but the help doesn't have a clue what they are selling and cannot offer reliable (IMHO) advice. Such may be the case at Grainger - we'll see.
If you send me an e-mail and ask, I will share my success / failure in a month or so when I get back to my BS.
Good luck.