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Old 09-14-2013, 09:11 AM
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NHRA Rulebook, General Regulations 3.1, Brakes:

Lightening of backing plates, brake drums, and/or brake shoes by cutting or trimming metal
prohibited. Cooling or lightening holes may not be drilled in cast iron disc brake rotors.

Author's Note: Aftermarket disc brake rotors are not cast iron. OEM rotors are cast iron.
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