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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.

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โˆ™ 2005-09-07 19:09:09
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Q: When looking at a v6 3100 engine how do you tell what is the intake and what is the exhaust?
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On a 3.1L 3100 SFI V6 engine the pushrods keep breaking after you replaced the head any idea why?

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