I645 dzakatevedzana injini dzakapinda mukugadzirwa muna 1965. Sezvo 567 yakatevedzana yakanga yasvika pamiganhu yayo mukuwedzera kwebhiza, kusimuka kukuru kwaidiwa; izvi zvakaitwa nekuwedzera bhora kubva ku8 + 1⁄2 mu (216 mm) pa567 akatevedzana kusvika 9 + 1⁄16 mu (230 mm) pane 645 akatevedzana, uku uchichengeta imwechete sitiroko uye deck kureba. Nepo crankcase yakagadziridzwa kubva ku567 akatevedzana, 567C uye gare gare injini (kana 567 injini dzakagadziridzwa kuita 567C zvakatemwa, dzimwe nguva dzinonzi 567AC kana 567BC injini) inogona kugamuchira mazana matanhatu nemakumi mana neshanu sevhisi zvikamu, senge magetsi magungano. Sezvineiwo, iyo 567E injini inoshandisa 645E yakatevedzana block ine 567 akatevedzana magetsi maassemblies.

Ese 645 injini dzinoshandisa Roots blower kana turbocharger kutsvaira humburumbira. Kune injini dzine turbocharged, turbocharger inotyairwa negiya uye ine clutch inomhanya inobvumira kuti iite secentrifugal blower painomhanya yakaderera injini (apo kubuda kwegasi kuyerera uye tembiricha chete zvisingakwanisi kutyaira turbine) uye turbocharger inofambiswa nemhepo. nekumhanya kwepamusoro. Iyo turbocharger inogona kudzoka kuita se supercharger panguva yekuda kwekuwedzera kukuru kweinjini yekubuda simba. Kunyange zvichidhura kuchengetedza kupfuura Roots blowers, EMD inotaura kuti dhizaini iyi inobvumira "zvakanyanya" kuderedza kushandiswa kwemafuta uye kubuda, kuvandudzwa kwepamusoro-soro kuita, uye kunyange kusvika ku50 muzana yekuwedzera kweakakwira akayerwa simba rebhiza pamusoro peinjini dzinoputika Roots zvakafanana. kuchinja injini.