Header Valve thingy on right hand side

[Morrie01]

Can anyone please yell me what the valve thingy is on the right hand side header as per in the photo.
It turns. Maybe something was attached at some stage from the original carby
I can hear an exhaust leak down there somewhere as well but not sure if its coming from this valve or not.

 

[71Beeper]

The valve thingy you speak of is called a heat riser valve.
Nothing from the carb is attached to it.
Here's a photo of what it looks like.

 

[493 Mike]

And, it forces exhaust gases to travel up through the passages in the cylinder heads, through the intake manifold, releasing heat to speed up the vaporization of the fuel and better combustion. The shaft has bushings which wear out and leak and the antirattle spring rusts out and falls off.
Mike

 

[jimbosride]

Just wondering ,Would it be a good Idea to keep this set up during restoration or leave it off?

 

[Bird 426]

It's kinda of an up to you thing. My one car that has stock exhaust manifolds, yes, I rebuilt mine. Other people weld them open, not for me. If you go the rebuild route, you should check your heads and intake manifold passages to make sure that they are not blocked off with carbon. They need to be open for the heat riser to operate the way it's supposed to.

 

[oldbee]

IMHO, leave it operational. Fix any leaks tho.

 

[Morrie01]

Right that all makes sense.
The spring is long gone by the looks so the valve can just do its own thing.
I take it the spring holds the valve shut and the pressure from the exhaust gas exiting holds it open?
Leaking from it makes sense too.
Maybe time for new headers...

 

[oldbee]

My spring is gone also, I have a piece of mechanics wire holding mine open. Warms up the choke in about 3miles/kilometers. Not perfect, but it’s still there. Cold weather driving would make totally operative a necessity.

 

[Bird 426]

Well, headers would actually make it worse, or the way it is. Not trying to discourage getting headers. Headers, aluminum cylinder heads, and aftermarket intakes do away with the heat crossover. They are just cold hearted till they get up to temperature.