Sheet metal advice

[mikedevore]

I just fabbed an air box for my 6-PAK scoop. I need advice on the best or proper tool to cut an opening for the carb. It needs to be round & 12" in diameter. The box is already installed to the hood & cannot be removed. Its made with a light gage aluminum.
I will post pics when completed.

Thanks

 

[67Dart440GT]

http://www.mcmaster.com/#hole-saws/=7vf0ec

Check out some of the adjustable cutters. Kinda expensive but I doubt you would find a hole saw that big??

 

[camd64]

Plasma cutter and a protractor setup. :thumbrig: otherwise an air saw would probably be easy.