We could use more information in regards to your need. Durant did not make a car in 1927. Is your car a Star? The 1927 Star model R did have a Continental 6 cylinder (14L or 15L). Durants in 1928-29 did have 6s but they came in more than one size/model.
Do you have a motor? What is wrong with it? There should be a brass tag on the driver's side, what model is it?