Actually, I now see that you are quite right. That was an error in my earlier post when I referred to the MkIV 1800S. The wheelbase didn't change until later with the S2 Vixen, it was just the engine and gearbox that moved slightly forward. Sorry about that, my knowledge of Granturas starts to fade out once we get past December 1965!
Interesting point you make about the possible reason for the different tracks. Useful info for anyone considering builing a 1622cc Grantura MkIII for pre-63 racing.
TF
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