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Old 03-15-2006, 10:33 AM
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exhaust gaskets?

At work last night, a guy told me that the early chevy 350 and 454's did not use exhaust manifold gaskets to the head. That they were a machined surface and thus didn't require a gasket.

I know the new Mercedes 900 and 4000 diesel engines do not use a gasket between the turbos and exhaust manifolds for this reason and work quite well.

Can anyone shed some light on this? Not that I don't believe it, just the first that I've heard it.

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Old 03-15-2006, 10:50 AM
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its news to me
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Old 03-15-2006, 01:41 PM
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Lots of them didn't have gaskets from the factory. They made a precisely machined surface on both the head and the manifold, and bolted them together. Once the manifold has gone through lots of heat cycles, however, if it is removed gaskets must be used, as the shape of the sealing surface gets distorted.
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Old 03-15-2006, 02:42 PM
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Seen lots of engines without gaskets. The manifold port is usually a tad bigger then the head port, so leaks are not a big issue. But as SBCF states, once you pull the manifolds, its best to put gaskets on them. They do twist and distort after time.

Mark
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Old 03-15-2006, 05:17 PM
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Or just take the manifolds in the the machine shop and have them milled flat again, I think that might be worth it instead of using gaskets that will just blow out later down the road.
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Old 03-15-2006, 05:31 PM
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Quote:
Originally Posted by 351fairlane
Or just take the manifolds in the the machine shop and have them milled flat again, I think that might be worth it instead of using gaskets that will just blow out later down the road.
This is true. On my personal vehicle, this is what I do. On a customers vehicle, I give them the price to get it done, and get asked to put gaskets in because it is cheaper (at least they think it is, when you have to do it 3 or 4 times, it isn't).
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Old 03-16-2006, 06:43 AM
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thanks for the replies!
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