You probably won’t be able to notch it with an end mill, races are typically too hardened for that. Bearing splitter, abrasive cut off wheel or some heat would be likely the best way. You should be able to cut a couple of notches & hit it with a chisel to either crack it or shatter it.
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Usually your bearing splitter works a treat on these.
Or a Dremel with a cut-off disc.
This is a bearing splitter (of which I’m pretty sure we have at least one)
https://www.amazon.com/OTC-1123-Bearing-Splitter-4-5/dp/B0002SR46I
This is a bearing splitter being used with a press (of which I hear tell we also have at least one)
IF you need to cut anything, abrasive wheel is likely your friend. I’d use a grinder, but a dremel should also work.
Here’s Eric the Car guy using one. I generally find most of what he does here unnecessary, but your mileage may vary.
PS at home, I jerry rig a 3-jaw and a hose clamp to do this job. I don’t recommend it, but it can be done.
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I have also in the past cleaned the race then welded a couple bolts to the race. Then use a small piece of channel to tighten the bolts to the channel. Comes off really easy that way.
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I don’t think we had a bearing splitter, but we do now. It’s amazing how easy things are with the correct tool, took about 2 minutes to get them off
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Could have sworn I saw one once upon a time back with the Harbour Freight press, but I could be mistaken, and/or it might have been on loan/there with a member, rather than “ours”.
Either way, good acquisition!
They are unbeatable for separating bearings. 
Did you have to cut anything off before pressing the bearing race off?
No cutoff wheel or heating was necessary, the edge of the bearing splitter was narrow enough to get under the lip on the bottom of the race.
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We leave for the race in less than 7 days, the rear suspension is back in (going to take it to get aligned somewhere instead of using string method ourselves again), safety orange paint is on thanks to @jottwell and we started putting on the decorations / vinyl stickers. Will be mounting pulse jet this weekend.
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Are you guys working on the car tonight? If not, do you want to load it up for alignment tonight or tomorrow?
I was going to be there tonight around 8pm to put in some insulation on driver floorboard and put on the new tires, would be good to load it on trailer tonight for alignment.
Ok, I’ll be there around 830 and we’ll load it up when we’re done.
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The car is about as ready as we can make it for the race this weekend, crossed everything off on our todo list.
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Good luck and prayers for safe return.
I’ve enjoyed reading about the progress, and maybe I’ll find some time to help for the next race.
Good luck in Houston and kick ass!
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The car looks really great!
Good luck, we are counting on you.
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Just remember, Second is first Loser! Go fast and take chances!
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Is it just me, or is ‘Brakes,’ in fact, not crossed-off the To Do List … … … ?
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You’re racing, you don’t need brakes. Lol 
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