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As long as the angle isn't too far off straight, a swivel socket will work. I just checked my manifolds and I see that the intake is in the way of a straight extension. You could use a box wrench and judge the torque by comparing with the other bolts. Or use a spring scale on the end of the wrench. The spec for the center clamp bolts is 15-20 ft-lbs, so 15-20 lb of force on a foot long box wrench would be correct. Or 30-40 lb on a 6-inch long wrench.