Ridge Reamer should be called "block screwing up machine" I have never ever seen a ring broke from "running into the ridge" just hone the thing, add some cheap rings and away you go--never a problem--do not use a ridge reamer--they are a stone age tool--just get a shop to hone the block , Wash the heck out of it and go--it will be just fine. Run the reamer, Bell out the top of the bore and you have a junker until you bore it and then many can't be saved from the massive attack done by the well meaning back yard builder ( I admire All back yard builders and have great respect for their efforts, as they usually do just fine) as long as they do not borrow a ridge reamer