Ford tested the BDGs quite a few years ago now and it was filmed for a program in the Uk.
They were testing the best spec BDGs they could build and everyone went BANG at a little over 10500-10600rpm.
They were uasable to 10,000rpm.
I had one limited to 9,500rpm and this was very reliable.
Ford was testing to see if the engine was a useable proposition for a particular race formulae.
To watch 3 engines in the Dyno cell go bang was awefull and to be told a further 2 had done the same thing didn't help either.
If they had been succesful in extending the rev band the engine would of become much more availible to the public and much cheaper on parts.
I think the guy with the escort is very wise to keep it to 9500rpm.
It would still be huge fun in a street car.
If it goes to 14k then I think he needs a new rev counter.