Exhaust manifold leaks

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72Plymouth

72Plymouth

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My passenger side manifold has an exhaust leak. It seems to have started after the engine was rebuilt.

I just had the exhaust system done and it still leaks around there. They said it was coming out near that heat riser thing and where it connects to the head. There is a lot of rattling noise coming from there.

Do I need to get a new heat riser kit and have the manifold resurfaced or is there anything else that can be done?

Thanks for any help with this
 

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I would start with an exhaust manifold gasket set, it is fairly cheap and an easy task to place them on the passenger side.
As far as the rattle with the heat riser, you can wire it open to stop the rattle. It would not stop an exhaust leak, but would stop the rattle so that you could isolate the leak perhaps.
C
 
clhyer said:
I would start with an exhaust manifold gasket set, it is fairly cheap and an easy task to place them on the passenger side.
As far as the rattle with the heat riser, you can wire it open to stop the rattle. It would not stop an exhaust leak, but would stop the rattle so that you could isolate the leak perhaps.
C
Click to expand...

Thanks. The manifold gasket is less than a year old. I was thinking about something like that to stop it from rattling. I would just need to make sure it is in the right direction.
 
The heat riser kit will have new bushings in the kit which, if the old ones are worn, would fix the leak there. However, a very common mistake on small blocks is to run heads with the air injection holes below the exhaust ports and not stop them up. I've seen people overlook that a LOT. I would begin by simply removing the manifold and inspecting everything.
 
StrokerScamp said:
The heat riser kit will have new bushings in the kit which, if the old ones are worn, would fix the leak there. However, a very common mistake on small blocks is to run heads with the air injection holes below the exhaust ports and not stop them up. I've seen people overlook that a LOT. I would begin by simply removing the manifold and inspecting everything.
Click to expand...

Yeah I looked into them. What about the air injection holes? Everything is original on the motor.
 
72Plymouth said:
Yeah I looked into them. What about the air injection holes? Everything is original on the motor.
Click to expand...

How do I know? I don't even know what vehicle we're talkin about. IF it's the car in your avatar and it has the original 72 engine and it still has all the original hard parts, it shouldn't have air injection holes.
 
You don't really need the heat riser in Vista, CA, so simplest would be to plug the holes with a screw, as suggested. If you don't have a tap, or can't swing it with the manifold on the car, maybe a thread cutting screw would work. It doesn't have to be strong. More important is that the cross-over passage is not plugged with carbon, as it was on my 273.
 
StrokerScamp said:
How do I know? I don't even know what vehicle we're talkin about. IF it's the car in your avatar and it has the original 72 engine and it still has all the original hard parts, it shouldn't have air injection holes.
Click to expand...

Thanks, so that isn't an issue with mine then. Yeah it's the car in my picture and it has the original engine.
 
I got the rattling to stop by rotating the riser all the way. I tried to see which direction is open and closed. But exhaust still came out the tailpipe either way it was rotated.

I think the main leak is coming from where the manifold connects to the head. It is pretty loud, but I cant find exactly where it is.
 
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