What did the c7 set you back ?Got deep into it the past few days and swapped a C7 from this M1078A1R. The original engine was locked up tight with so few miles on it and no explanation of why after disassembly. I did the typical "pull injectors and fill with penetrating oil and time" trick, pulled ALL accessory drives from starter to fan clutch, and even suspected locked torque converter when it wouldn't move but no..stuck solid. Oil was filtered showing no metal or contamination. I'm suspecting manufacturer error until I confirm it with a machine shop. The CAT tech in assistance couldn't pinpoint the fault either.
She is alive and well now! Pushing out 370 hp and runs so smooooth. I'm probably on a very short list of civi's to swap an engine on an A1R and it wasn't that bad. It has just a few more wires and hoses than your 3116.