Vacuum Lines

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Wilhay74

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Jun 29, 2026
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Location
North Carolina
First Name
Wiley
Truck Year
1974
Truck Model
c10
Engine Size
350
Good morning all,
Have 1974 Cheyenne Super with 350 engine all stock with stock breather and Rochester 2bbl. 2gv carb, The breather has 2 vacuum lines attached to it, when I bought the truck they were not plugged in to any vacuum sources or anything just hanging there. Can anyone tell or show me where these lines plug into on both ends ?

Thanks,
Wilhay74
 

ali_c20

Supporting Member
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Location
Austria
First Name
Alexander
Truck Year
1974, 1979
Truck Model
C20, K5
Engine Size
350, 350
Hello. Post some pictures, it makes it easier to understand what's going on and give the right answers.
 

Smtty58

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Location
Mass.
First Name
Lyle
Truck Year
1990
Truck Model
R3500 Crewcab
Engine Size
350
Did you mean air filter housing? Pics please.
 

Wilhay74

Junior Member
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Jun 29, 2026
Posts
6
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Location
North Carolina
First Name
Wiley
Truck Year
1974
Truck Model
c10
Engine Size
350
Yes the metal Breather that has the filter inside it. It has a clamp on bottom that holds 2 vacuum lines, where do these lines plug into on both ends?

Thanks
Wilhay74
 

75gmck25

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Location
Northern Virginia
First Name
Bruce
Truck Year
1975
Truck Model
K25 Camper Special TH350 NP203
Engine Size
5.7
Take and post a couple pictures. What you have might be original GM, or it might be a kludge put together by a previous owner.
 

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