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Smoothing the firewall can yield a clean, modern-looking engine compartment, but there are certainly some pitfalls to avoid. Someone has attempted, unsuccessfully, to smooth out the outside perimeter of the firewall on this ’57 Chevy. In situations like this, Cameron says that it’s easier to replace the entire firewall with a custom unit instead of trying to fix prior mistakes one section at a time. When doing this, it’s imperative to reinforce the body with X-braces under the dash and in the doorjambs to prevent the car from flexing.