I have been looking for a 1977-1980 Corvette Aluminum intake manifold torque specs for a cast Iron 350. I have seen from 11 ft lbs to 33 ft lbs. The 33 ft lbs must be for the stock cast iron manifold. I see aftermarket aluminum manifolds seem to require 25 ft lbs. This corvette aluminum intake is in a great shape, no cracks but I do not want to crack or warp it.
I have also seen reference to not tightening the end intake bolts as much as the center.
This is all on my 76 Monza.