Technical Exhaust Manifolds

I have always used the exhaust manifolds that have the exhaust "donut" as a loose item required between the manifold and pipe. This newer manifold has what is essentially the "donut" cast into the end. Is there a different type of fitting needed for the pipe or is it the same?

 

The end of the pipe would be similar, but no tube inside to support the inside of the donut.

Is an exhaust shop making pipes for you or what?

 

They are not. I'm a ways away from needing pipes, but was somewhat surprised when the manifold showed up with that as part of the casting. Just haven't used one before.

Is there still a gasket material needed between the two?

 

It's just a design change that happened about 40 years ago. I think they mostly went to metal donuts first, then decided to integrate it into the manifolds. Saves money building a car.

 

I’ll post a pic of y-pipe I removed so you can see what the pipe side looks like

 

You can see what Jim was talking about with no retainer for the donut.

 

Thank you guys!

 

Just think single flair. You can use cooper silicon if it's all pitted, but new should be metal to metal.

 

I just bought a couple of stubs with the flared end off E-Bay for my engine on the run stand. Just make sure you have the corresponding size flange with the inverted flare. Tightening the flange "sandwiches" the pipe between the manifold and flange. No gasket needed.

 

Late model Fords use something very similar. They work very well. I’ve never had one leak or need sealer.