From what I just read(don’t know if it’s current or not), the personal index hit starts at .50 under.

The permanent hits start at .610 under, and are on a sliding scale.

https://www.dragzine.com/features/car-fe...ion-eliminator/

Edit....... that appears to be out of date.

The new rule seems to be personal hit at .610, permanent hit at .710 during eliminations.

68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads