Not Ranked
I don't know whether or not a billet flywheel would fragment (I'd guess not), but I can attest to what can happen if they come off in one piece. In the early sixies I saw the aftermath of a cast wheel that broke off thru the flange bolt holes to the crank. The flywheel and complete clutch assembly came off as a unit; exploded the bellhousing; ripped the pecker shaft out of the trans; tore out the bolts attaching a 3/8" scattershield to the frame; and still ended up a hundred feet off the track. The driver was uninjured, but probably thanked his lucky stars the wheel went down instead of up. That's one big mass of s*** to be running around on it's own at 6 or 7 grand. Myself, I wouldn't even consider removing a portion of the bottom flange. Some engineer, a whole lot smarter than me, obviously decided those bolts just might be needed.
Just my 2 cents.
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