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In the case of THAT Grantura the owner would presumably have had to establish that his car that his car had (1) the correct (narrower) track of the pre-66 Mark III; and (2) that the engine was positioned correctly (i.e. not in the further forward position found on the post-65 MkIV). The Kamm or Manx tail was used on Granturas built both before (MkIII) and after (MKIII or MkIV) the 31 Dec 1965 cut off but other measurable features determine whether a car complies with the homologated specification for Appendix K racing or not.
Having said that, whether or not a Kamm-tailed MkIII Grantura ever raced in an International meeting in period is just as much of a question mark as whether a round-tailed Griffith ever did the same. The FIA's rules on bodywork silhouette seem, on the the hand, to be perfectly clear but, on the other hand, to be rather inconsistently applied in the case of TVRs. A source of great frustration for owners of both Griffiths and Granturas. Why can the FIA gurus not just say "Look, we don't really know what was going on in period but as long as your cars meet the mechanical specs laid down in the homologation papers you can run either the round-tail OR the Kamm/Manx-tailed bodywork"?
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