unknown headers
Big block headers, only identifying marks are the numbers 413 stamped into the flanges, nothing else 1 7/8" primarys, 3 inch collectors. Any ideas what they are for and or who made/makes them? I thought maybe they were for a truck but really don't know for sure. They bolt to big block heads.
Big block headers, only identifying marks are the numbers 413 stamped into the flanges, nothing else 1 7/8" primarys, 3 inch collectors. Any ideas what they are for and or who made/makes them? I thought maybe they were for a truck but really don't know for sure. They bolt to big block heads.
