The DVF became so strong, that Keith Duckham provided an all-wheel drive for F1- racing cars. By building a complete car, they went, for the first time, into competition against Lotus. He even employed, among others, Robin Herd from McLaren. The development took two years, indeed, the finished racing car was difficult to drive. The development of gently engaging differential locks was lagging behind, and when it came onto the market later, it was too late, the grippy wide tyres and the spoilers had reduced the problem distinctly. Due also to the death of their designated driver Jim Clark in 1968, the project was abandoned.

Furthermore, the winds of change were blowing through the company. It was a matter of distributing many tasks, and with it, the responsibilities. Mike Hall, who you'll remember, came from BRM, was given the assignment of reconstructing the FVA into a Belt Driven A Series. As the name already indicates, silent belts instead of noisy gearwheels were fashionable. He discovered a more suitable engine-block, so that, in reality, in the end it would be almost a new construction, perhaps giving even more performance than the paragon.

In the beginning the BDA as an engine for serial cars was going nowhere. In spite of the expansion, the capacity at Cosworth was insufficient. In the beginning of the 1970s the GA-project followed. The idea was, to modify the Ford Capris as competition against the BMW light-coupès. While testing to get anywhere near the BMW 3,5 liter, the engine block flagged, even though enough material was available. This was Mike Hall's big moment, by stabilising the block through bearing covers with four bolts, later even a capacity of 3,1 liters was possible. For its homologation, 100 engines had to be manufactured. Once again, a great deal of work for Cosworth.

Right in the middle of the hustle-and-bustle of company business, in 1973 the news of Keith Duckham's heart attack burst in. The result of wear and tear and smoking were obvious. According to the wishes of the two founders, the company should never have been allowed to grow that big, even despite the oil-price crisis, the production-sector was booming. Cosworth was not fanatical in its search for horse-power, it now found itself in the difficult area between one off- and mass production.