step 1; 26 in-lb, step 2; 106 in-lb, step 3; 132 in-lb
Intake manifold torque specifications for the Olds 403 is listed as 30 ft-lbs.
Need to check the 4 corners on the intake manifold. It is common for the intake to leak engine coolant.
Next to the water neck on the front of the intake manifold.
On the 4.3 engine it is located under the upper intake manifold. The upper intake manifold must be removed to gain access to it.
It is located on the intake manifold near the thermostat housing.
You did not mention the engine size. Regardless, it is in the thermostat housing on the intake manifold.
The intake manifold is where the air and fuel mix and enter the engine. The exhaust manifold is where unspent gas and air exit the engine. In other words the intake manifold is where the engine breathes in and the exhaust manifold is how the engine exhales out.
If your engine is a 4.3L V-6 with CPI (central point injection) it is inside the upper intake manifold. The upper intake manifold is bolted on top of the normal intake manifold. The throttle body is mounted on it and your fuel lines terminate into the center of this.
The torque specifications, for a 4.3 liter engine manifold, is 45 pounds per square inch. Torque the manifold bolts in 15 pound intervals.
Its called an "Intake Manifold Tuning Valve". Its function is to join or separate the two sides of the intake manifold. It has a minor effect on engine performance. It can be difficult or impossible to remove.
Assuming this is a 4.3L engine, the fuel pressure regulator is located under the upper intake manifold. The upper intake manifold must be removed to gain access to the regulator.
The intake manifold attaches to the heads of the engine and send an air and fuel mixture to the combustion chamber through the intake valves. The intake manifold is usually situated on the top of the motor.