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The firewall above is a Murray stamping, noted by the use of a cage nut rather than a 'D' nut, and the specific shape of the teardrop.

Non-Murray firewalls had a similar but different shaped teardrop indentation.

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In April 1931 Ford began converting the gas tank design and fuel shutoff valve location from a 'flat firewall' and inside gas valve design, to a design having an 'indented firewall' ('inverted teardrop depression') and an under-hood gas valve arrangement.

This design change is often useful in dating approximate build timing of various early 1931 models.

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In 1930-31, the body tags were typically made of zinc (and later aluminum) and were drive-riveted or screwed to the firewall below the patent plate data tag under the hood.

tables below there are references to 'flat firewall' and 'indented firewall' body details for some 1931 entries.Read our guide to learn what MLA is and how to make properly formatted citations.Visual guides are also included to help you locate information needed for citations. Our comprehensive guide will teach you how to format your paper and create accurate citations.See the first related link in the list at the bottom of this page for more information.The first column lists the body style number assigned by Ford and used in their internal operations.You must agree to the changes in order to access your account, and all the work associated with it.

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