Interesting stuff…. You would have thought that the ZF would conform to Ford standards right from the get-go (thereby not requiring a bushing or bearing adapter in the flywheel…)
I say this based on recently reading John Horsman’s “Racing in the Rain”, in which he states that John Weyer put in orders for prototype ZF -1s for very early GT40s, due to the reliability issues experienced using the Italian Colotti transaxles used in the first years when he was running Ford Advanced Vehicles in Slough, and developing the cars.
You would have thought he would specify an input shaft that would fit the Ford flywheel (and associated bearing) directly…
Not doubting JB’s input - I believe! But it’s just another mystery lost in the mists of time.
Maybe the ZF as we know it came from an even earlier application?
Thanks