Thanks Lima and everyone else, I think we may have sorted the casting number(DIVE) and the build code(2D14R) on my mates block enough to satisfy the examiner, however my own block taken from a 71 T/Bird, is "DIVE" but the build code is "0K13R" !!!! which seems contradictory? the number as described by LIMA reads "1Y100661, which again would appear to be 71? any feedback on that please? Dave