Intake & exhaust manifold torque

[aermotor]

I had problems with intake manifold leaks - two tries replacing the gasket in order to stop intake leak. The thought came to me that maybe there is a preferred torque sequence. I torqued progressively 25, 30, 35, 40 and final 45 lbs. on 4,2,3,1 studs. Any comments appreciated.

John