Matoorada taxanaha ah ee 645 waxa ay soo galeen wax soo saarkii 1965. Maadaama taxanaha 567 uu gaadhay xadka kor u kaca tamarta faradaha, barokac weyn ayaa loo baahday; tan waxa lagu gaadhay in la kordhiyo boodhka 8+1⁄2 in (216 mm) ee taxanaha 567 ilaa 9+1⁄16 in (230 mm) ee taxanaha 645, iyada oo la ilaalinayo isla istaroogga iyo dhererka sagxada. In kasta oo sanduuqa wax laga beddelay ee taxanaha 567, 567C iyo matoorada dambe (ama 567 matoorada lagu beddelay 567C qeexitaannada, mararka qaarkood loo yaqaan 567AC ama 567BC matoorada) waxay aqbali karaan 645 qaybo adeeg oo taxane ah, sida shirarka awoodda. Taa bedelkeeda, mishiinka 567E wuxuu shaqeeyaa 645E taxane ah oo leh 567 taxanayaal koronto ah.

Dhammaan matoorada 645 waxay ka faa'iidaystaan ​​​​Roots blower ama turbocharger si ay u xoqdo dhululubada. Matoorada turbochargerka ah, turbocharger-ku waxa uu ku socdaa gear-ka waxana uu leeyahay xajin xad dhaaf ah kaas oo u ogolaanaya in uu u dhaqmo sidii afuufaha centrifugal ee xawaaraha yar yar (marka socodka gaaska qiiqa iyo heerkulka kaligiis ay ku filan yihiin in ay kaxeeyaan marawaxadaha) iyo turbocharger kali ah xawaare sare. Turbocharger-ku waxa uu ku noqon karaa u shaqaynta sidii supercharger inta lagu jiro baahida korodhka weyn ee tamarta wax soo saarka mishiinka. In kasta oo ay ka qaalisan tahay in la ilaaliyo Roots afuufayaasha, EMD waxay sheeganeysaa in naqshadani ay u oggolaaneyso "si weyn" hoos u dhigidda isticmaalka shidaalka iyo qiiqa, hagaajinta waxqabadka sare, iyo xitaa ilaa 50 boqolkiiba korodhka ugu sarreeya ee lagu qiimeeyay matoorada Roots-afuufay isla isku mid ah. barokaca matoorka.