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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



I bought a 70 440 HP block that was standard bore , some donkey went at it with a ridge reamer. I didn't find out how bad it was till time to bore it , started with .030 , one cylinder the cutter didn't even touch the cylinder in one area til about 2" down the bore , next was about 3/4" , he got better as he went along... ended having to bore it .040 , except the one cylinder that didn't clean up till .075 ... that one got a sleeve