ðiːz tʃˈeɪndʒᵻz dɪdnˌɑːt ɐpˈɪɹ ɔnðɪ ˈoʊpən kˈɑːɹz, wˌɪtʃ nˌoʊ lˈɑːŋɡɚɹ ɪŋklˈuːdᵻd ðə ɹˈɪpli spˈoːɹts, ʌntˈɪl nˈaɪntiːnhˈʌndɹɪd θˈɜːɾi ˈeɪt wɛn ðə kˈeɪmbɹɪdʒ ænd ðə kˈɑːnweɪ kˌæbɹiːəlˈeɪ ɡˈeɪnd ɐn ˌæljʊmˈɪniəm sˈɪlɪndɚ hˈɛd ɔnðɪ ˈɛndʒɪn ænd ɐ hˈaɪɚ kəmpɹˈɛʃən ɹˈeɪʃɪˌoʊ.
These changes did not appear on the open cars, which no longer included the Ripley sports, until 1938 when the Cambridge and the Conway cabriolet gained an aluminium cylinder head on the engine and a higher compression ratio.