90 Deg Oil Filter Adapter Torque Spec?

I have the aluminum adapter on my Cuda and have had it apart 2 times and each time after I put it together I torque it down and run it and it seems to be OK (no leak) then about a month later it starts leaking and I have to re-torque it then it seals up and don't leak anymore. I guess the gasket shrinks a little from heat.