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It's ALIVE !!! Mark Patey and twin Mike Patey working toward another world record. Lycoming 720/780
GAM Group - The heart of the Aero Commander 680 is the Lycoming IO-720 producing 400 hp. Getting ready for test after an overhaul by Neil and Jackie Moon in the GAM
Lycoming IO-720-D1CD & IO-720-D1C Engine Parts Manual | eBay