Allis-Chalmers had begun using GM Diesels prior to WWII as its 'standard' diesel engine. Allis-Chalmers did not at that time produce a reliable diesel engine of its own. GM diesels were fitted to the HD-5, HD-7, HD-9, HD-10, HD-14, HD-15, HD-19 and HD-20 and all of them were '71' series models of various types apart from the HD-20 that ...
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