I think im going to scrap my first shot at the aluminum firewall here. Right in the center towards the transmission there is that big curve/dip. First I just went around it and cut the aluminum to go over it, and leave it open. Not go near it basically. I think I made my cut too high and it would be visible with the engine in. The more I stare at it the more I think I can just go straight over most of this curve, and make it flat. Would there be any clearence problems doing that?

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Hard to imagine without seeing pics.