Might surprise you how such drastically different engine/chassis combos end up so close in the mains.

Top qualifier vs top lap in the Main:

1200 Q: 15c  10.29
1200 M: 34    10.63

600 Q: 2L  10.308
600 M: 17  10.556

600R Q: 5  11.32
600R M: 5  11.129

250 Q: 12  11.03
250 M: 12  10.725

100 Q: 1  13.61
100 M: 95  13.28