In 1970 , Ford asked Weslake and Co to build the BDA Engine for them , and by the end of 1970 the production line had been installed at Rye and production was under way . In 1970 , Ford asked Weslake and Co of Rye to build the BDA Engine for them , and by the end of 1970 the production line had been installed at Rye and production was under way .