Don't know what the HP was but my friend Jimmy Smith pulled his down after about 200 passes, the car ran mid 6's on alcohol @ 3,000 lbs, so i would image about 600 HP, he had the 3 center main webs cracked, but no bearing problem, this was just maintinance. He went back together with a 4 bolt splade caps on a 2 bolt blk. i was running a blown alcohol with a stock blk. no bearing issues but the cylinder cracked,
I'm guessing 600 is pushing the envelope.
JMO
Zip.