Thanks Bill, glad you added that last reply as I am in the Detroit range of numbers for CB which are stamped on right forward chassis rail, nothing at rear, engine number is on left front rail & repeated midway along left side rail. However I have remains of two CB`s which I am attempting to make into one and there is some contradiction of numbers between the the two, let me try & explain : No.1 has no engine nor Serial number tag, the chassis however is stamped with an engine number & what I presume is build number 6701292 plus a number 1753 immediately under it on right side. No.2 has Serial Number tag 6701242 on bulhead/firewall but absolutely nothing I can find on the chassis,have yet to have it sandblasted so something may yet be revealed. Any input out there ?