MEngr,
For the record AC started using the Continental flat head F163. F227 engines around 1972/73 to replace the AC engine as part of a "cost reduction" program. What a mistake. Then later went to a private labeled Teledyne Continental overhead valve engine TM27 & Waukesha engines for lifts above 6K capacity around 1980/81 to try to regain lost market share & reputation. And then in 1982 start using the Mitsubishi 4G53/54 engine and transaxle in their "World Truck to compete with "off shore" competition.
Then in1984 AC lift trucks died the death of a rag doll & AC corporate disappeared of the NYSE.