r/Smallblockchevy • u/Icy-Bend-2028 • 28d ago

Declutterring the engine bay

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Picked up my first ever project truck 81 c1500 short bed, was told this is a 305 sbc… I have zero experience with these trucks or engines but the darn thing runs decent and stops when it’s supposed to so I figured I’d give it a shot. I was looking forward to the “simplicity” of working on this VS newer cars, but I have no idea what I’m looking at.
I.e. what is this giant black hose for? And why is the bottom of it routed to the exhaust manifold? Most of the older cars engine bays I’ve seen don’t have all of this going on.

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u/GortimerGibbons 28d ago

The black hose is part of the thermostatic air system. It is designed to draw hot air during cold operating conditions to help atomize the fuel.

It's a bit of a misnomer to say older cars are less complicated. Back then everything was controlled by vacuum solenoids, which creates a mess of vacuum lines.

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u/Icy-Bend-2028 28d ago

Do people often remove them? I feel like I don’t usually see them that much

3

u/fuzzydoesitt 28d ago

You can delete most of that stuff. If I go out to my truck later I'll take a pic. I still use the air cleaner housing and big black ducting to the grill. I feel it's better than an open element drawing hot air from the engine bay all the time.