I found the torque specs for my mounting bolts but unsure of which applies to my motor

 

theres 2 specs, 50 lbs to standard mount to transom and 90 lbs to setback and metal lift plate.

 

I think my boat 2007 nitro z6 115 opti has the metal lift plate, with the hydraulic trim. the motor mounts to a bracket that mounts to the transom, has 2 brackets with holes in it to set the pitch of the motor. Am I correct in assuming I have the setback and metal lift plate mount?

Yes you are but what part are you torquing the bolts on?

 

Some models have 2 seperate plates, one transom mount and one is incorporated as a unit, if yours is one unit it's 90lbs/feet,  thats the reason for the question.

through the mount and transom of the boat

Then it's 90 foot pounds my friend.

excellent, thank you sir

It's mainly going to depend on the type bolts you use.

Grade 5's are approx. 60

Grade 8's are approx. 80

18SS are approx. 50

Check a standard torque spec table for the exact numbers.

I always install 1/2" thick, 3" wide SS plates on the inside of the transom. You can buy fancy ones with somebody's logo on them or just get a piece of SS bar and make your own.

When mounting a jack plate is also use only Grade 8 bolts, even if going to be used in salt water, I just complete seal them in silicon. I just don't trust the strength of SS bolts to hold with much offset.