ðə mˈoʊst vˈɪzᵻbəl tʃˈeɪndʒ wʌz tə mˈuːv ðə vˌɛntɪlˈeɪʃən ɡɹˈɪlz fɹʌm ɐlˈɔŋsaɪd ðɪ ˈɛndʒɪn tə hˈaɪɚɹ ˈʌp, dʒˈʌst bᵻlˌoʊ ðə tˈɑːp dˈɛk wˈɪndoʊz, kənˈɛktᵻd tə ðɪ ˈɛndʒɪn kəmpˈɑːɹtmənt baɪ tɹˈʌŋkɪŋ, plˈʌs ðə ɹᵻmˈuːvəl ʌvðə ɡɹˈɪlz fɹʌmðə ɹˈɪɹ ˈɛndʒɪn kəmpˈɑːɹtmənt dˈoːɹ.
The most visible change was to move the ventilation grills from alongside the engine to higher up, just below the top deck windows, connected to the engine compartment by trunking, plus the removal of the grilles from the rear engine compartment door.