Is there any torque value for the bolt of the elastomeric engine mount bolt?

It's an AN7 bolt, so 450 - 500inch-Lbs -or- 37.5 - 41.7foot-Lbs -or- 50.843 - 56.53newton-meters

Don't forget to add the friction drag (prevailing torque) to the above...typically in the sub 20inch-lbs range...