Firewalls are available for your small or big block 1930-31 Ford. The small block firewall is set back 3" and the big block firewall has a 5" setback.
The flat firewall fits all 30/31 passenger cars and trucks. It's a 2-piece firewall that when welded in place, makes a flat firewall with no set-back. This will give you approximately 2.5" more back space than your stock firewall. It works well with flathead and V6 engines. It's made in 2 pieces and allow you to use the stock gas tank. The bottom edge is made to trim to your floor or a Direct Sheetmetal floor.
Direct Sheetmetal firewalls are made from 16 and 18 gauge, cold-rolled steel and are all hand-formed in their shop.