Pretty cool that it's still in the family. I have basically no heirlooms from the families, other that a couple of Aladdin Mantle Lamps.
I've got a 1 1/2hp McCormick engine & a Maytag engine (I love to hear that maytag run). I originally got the McCormick to use on a horseless carriage project, but it's too heavy for what i want. That Hercules looks like my McCormick in that it may not be a true "hit & miss", rather it has a regular valve train & you regulate speed with thecarburator instead ofa governor. I'll have to look closer at the picture.
Mike Sal