That is still unknown, although Vortech claimed overspeed did it.. Oil slinger broke off shaft damaged bearings etc etc... But then I see guys running 3.33 with no issues. :shrug:
My money is on the stock bov causing damage, I ran the 3.00 pulley with 20% OD for a little bit with no problems.
Countless guys running 3.33 & 3.15 pulley & a few shop build cars running 3.00 & even 2.75 I've read about before. Might of been jpc car with the oil fed 2200 but still way out of its rpm rang.
I dont know if this helps but when i bought my procharger D1x from beefcake, terry told me i would need either The procharger race valve or the tial 50mm. I was just going to go with the surge valve that comes with the kit.. but i went with the tial!