Although I did not find it in my 10th edition Johnson Service manual, I did come across it in another publication. It shows 24 to 36 in lbs. Hope that helps.
Thank you Dan. I have a Johnson torque chart that does not address the intake manifold. It does, however, call for 2-3 FT-LBS on the exhaust cover so that value makes sense.
Later model manuals (about 1980 up) have a list in the front that show a standard torque value for screw/bolt size. It is to be used whenever a torque is not spelled out in the section or application. Today’s engines use some special bolts/screws in certain applications that take certain procedures (Loctite, etc.) or torquing sequencing. Some require torquing (rubber mounts) letting relax and then torquing again. Exhaust cover bolts benefit from a drop of red loctite so heat expansion doesn’t loosen them in the long run. Just FYI.