During tests in Zeltweg, Wyer's engineer John Horsmann had the idea to increase downforce to the expense of drag, a new tail was molded with aluminum sheets taped together.
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Porsche Salzburg also entered a 917 K with the standard 4.5L engine for Hans Herrmann and Richard Attwood, while a third car with #24, which was qualified by Herrmann and Elford ahead of their #23 car, was withdrawn.
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Ecurie Francorchamps would not return to Le Mans until 1970 where Hughes de Fierlandt and Alistair Walker finished in fifth place in a Ferrari 512S.