C2 Heat riser

[dtaz]

Question: There are 2 lines on the heat riser side of the 340 HP motor, 1 goes from the exhaust manifold to the choke assembly, the other goes down toward the heat riser from the carb, but I'm not sure about the second one. Is it pulling a vacuum from somewhere? Thanks, Frank

 

[Rob]

What year Corvette??

 

[dtaz]

What year Corvette??

1963, 327 cu in, 340 HP

 

[Rob]

Moving into the C1/C2 Forum for greater exposure...

 

[Tom Bryant]

Are you referring to the rubber line that runs from the carb air horn to the steel line that goes down behind the exhaust manifold as in this pic I copied online? It's called a clean air line and completes the choke loop. On older engines the choke tube ran down and connected to the tube that ran through the exhaust manifold and was just open to atmosphere on the bottom end. This line connects at the previously left open lower end of the choke tube and goes into the air horn thus not allowing crud to get into the open choke tube.

Tom

 

[dtaz]

Are you referring to the rubber line that runs from the carb air horn to the steel line that goes down behind the exhaust manifold as in this pic I copied online? It's called a clean air line and completes the choke loop. On older engines the choke tube ran down and connected to the tube that ran through the exhaust manifold and was just open to atmosphere on the bottom end. This line connects at the previously left open lower end of the choke tube and goes into the air horn thus not allowing crud to get into the open choke tube.

Tom

View attachment 25454

Thank you Tom for a very good explaination. I guess there should be a hole somewhere in the bottom of the exhaust manifold for the other metal tube? Frank

 

[Tom Bryant]

Here is a drawing I found in the parts manual. Sorry for the sideways.

Tom