You might want to check out the SN & JN series of portable hones, not quite so expensive. Not cheap either, but maybe half the cost. I bought an SN-75 model some 20 years ago, for 100cc cast iron cylinders, it works great. Just need a big 1/2 inch drill to turn it.
Billy, I have an expensive floor model Sunnen Hone with loads of smaller mandrels but nothing big enough to do Briggs World Formula. I ‘ve found those flex drill driven hones to be less accurate with bore roundness. These floor models get the bore perfect for me. just my take on it
The portable hone isn’t a flex hone. It uses the same mandrel seen on the AN600 mandrel which is the mandrel I prefer to use when honing a briggs block or FV cylinder in my Sunnen machine.