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It depends on the quality of the material the rotor is made with. I've seen hundreds of circle track rotors glowing orange that are drilled and they endure pretty good.
Those rotors probably aren't drilled. Instead, they are cast with the holes in the mold. The higher quality manufacturers use the proper casting technique to get a good fill with no voids.
The Mercedes "drilled" rotors are made that way and they hold up nicely to heavy use on heavy cars.
We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
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