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NHRA rules require that all the holes in the firewall be filled. We took the easy way out when blocking the gaps left from ditching the air conditioning. Rather than welding them up, we made a cardboard template in a shape that blocked all the holes from the backside of the firewall, and then duplicated it from a sheet of 18-gauge aluminum. We riveted the aluminum in place and used black RTV silicone as a seal around all the firewall voids.