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Now the scary part: drilling the hole. You will need a L-O-N-G drill bit (think 18 inches) for this because you are not only drilling through the bumper cover, but the reinforcing bumper material and the steel rear bulkhead of the passenger compartment. Be careful to drill both straight and level.
LS1 Battery Relocation - Which Weigh To Go?

Now the scary part: drilling the hole. You will need a L-O-N-G drill bit (think 18 inches) for this because you are not only drilling through the bumper cover, but the reinforcing bumper material and the steel rear bulkhead of the passenger compartment. Be careful to drill both straight and level.  View Related Article

 

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