MT Prototype Headers for a 67 Buick GS 400
I have a set of headers for a 67 Buick GS 400. They have a build date 1-25-67 and inspection initials with the MT logo and part number 39892400. Does anyone know anything more about these. They have never been used. The flanges are tacked form the outside and welds ground smooth on the inside. I have photos. Thanks.
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