I use 8mm head bolts at 10 to 12 foot pounds & 6mm bolts at 6 to 8 foot pounds. Using those values for over 8 years on getting close to 1000 motors now.
Max torque for GOOD cast aluminum 8mm is around 204 inch pounds which is 17 foot pounds. Being we are talking about Chines cast aluminum I sure would not got to the high side or max.
Thanks Jeff