The intake portion of the 3100 starts where the throttle body (where the accelerator cable attaches) attaches to the plenum (upper intake), below the plenum is the lower intake. The exhaust manifolds are between where the Exhaust pipe connects to and attaches to the cylinder head. The first answer is great, but here's some more as I have just finished replacing the intake manifolds on my 1997 Pontiac GrandAm with the 3.1L engine. First of all, this is a two-piece manifold which is unusual, the first one I've see like this.... This engine is a 60 degree V configuration, and the lower intake manifold bolts directly onto both heads, essentially filling in the center of the "V", and providing air/fuel to the head intake ports. Its mostly obscured by the upper intake manifold that bolts directly to the lower portion. The upper and lower intake manifolds are cast aluminium. The exhaust manifolds are each on the outside of the "V", and bolt directly to the heads. They are cast iron (usually rusty iron color), and are covered by silver sheet-metal heat shields. There is a crossover pipe that connects them to a collector which connects to the rest of the exhaust system.
Not sure which engine you are working on. It should be a 3100?? Intake valves use the short ones, exhaust the long ones. It's been a while since I've done mine so I don't have the exact order memorized. The valve closest to the intake port will be your intake. Fairly easy to determine which is which.
The thermostat is at the left (driver) side of the engine under the air intake tube. To replace, drain the coolant, take off the engine air intake tube connected to the intake manifold on top of the engine and take off the air cleaner housing at the left side of the engine. Then take off the large coolant hose going to the engine on the left side. The thermostat is inside the cast aluminum flanged nipple housing that the large coolant tube is connected to. The bottom of the two bolts that connect the housing looks impossible to get at, but you can access 1/12 of a turn at a time with a standard open end wrench from under the exhaust. You do not need to remove the exhaust manifold, but getting behind and under it is tight. You do not need to completely remove both bolts that hold the flange on because the flange has an open slot. If you take out the bottom bolt, getting it started would be hard because it is quite hidden.
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