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Screw Size and corresponding torque values in INCH LBS!
10=25 to 35 inch lbs
12=35 to 40 inch/lbs
1/4"=60 to 80 inch/lbs
5/16"=120 to 140 inch/lbs
3/8"=220 to 240 inch/lbs
Although, I must confess, I don't use a torque wrench on the intake manifold.