Exhaust manifold question
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Elder User
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Exhaust manifold question
I'm ready to bolt on my new ceramic coated exhaust manifolds onto the block and noticed the block surface doesn't have a perfectly smooth machined surface like my manifolds.
Is that something to be concerned about? I obviously am thinking about potential exhaust leak issues between these two surfaces.
Thanks,
Drake
Is that something to be concerned about? I obviously am thinking about potential exhaust leak issues between these two surfaces.
Thanks,
Drake
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Elder User
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I thought these exhaust manifolds were mounted without a gasket. Do many people use a gasket there on these engines? If so, why wouldn't Ford put them on there in the first place?
Because racetruck
Joined: Apr 2007
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From: Monterey Bay, CA
They are typically mounted with out gaskets. I am not running them but they are available. Your block should be machined smooth and flat. In the event that its not for some reason, then a gasket would be in order.
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What brand do you recommend and where can I get them?
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Elder User
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I'm assuming that the Ford and international parts are identical, just being offered through 2 different sources?
I'm just curious why these gaskets weren't part of the original design? Does the heat these engines produce cause problems with a gasket material over time?
Thanks,
Drake
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Cargo Master
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From: Man Cave
If I was you I would just clean up the block surface as good as possible and bolt em up. If your manifolds are true they will seal up fine. If they dont you have the option of getting the manifolds machined or using the gasket. The gasket in the main is not needed its just a more convenient option. I used it on mine. My thinking was while Im there I might as well wack one on. It turned out to be a PITA. For some un known reason the gasket kept creeping.
Only on the passenger side. So I took it off, straightened it out and put it back on with 25lbs more torque on the bolts. It did it again so I have taken it off . So far no leaks so I dont think it was necessary. Im not saying that this will happen with all gaskets its something to consider.
Only on the passenger side. So I took it off, straightened it out and put it back on with 25lbs more torque on the bolts. It did it again so I have taken it off . So far no leaks so I dont think it was necessary. Im not saying that this will happen with all gaskets its something to consider.
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Elder User
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If I was you I would just clean up the block surface as good as possible and bolt em up. If your manifolds are true they will seal up fine. If they dont you have the option of getting the manifolds machined or using the gasket. The gasket in the main is not needed its just a more convenient option. I used it on mine. My thinking was while Im there I might as well wack one on. It turned out to be a PITA. For some un known reason the gasket kept creeping.
Only on the passenger side. So I took it off, straightened it out and put it back on with 25lbs more torque on the bolts. It did it again so I have taken it off . So far no leaks so I dont think it was necessary. Im not saying that this will happen with all gaskets its something to consider.
Only on the passenger side. So I took it off, straightened it out and put it back on with 25lbs more torque on the bolts. It did it again so I have taken it off . So far no leaks so I dont think it was necessary. Im not saying that this will happen with all gaskets its something to consider.
Cargo Master
Joined: Apr 2009
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From: Man Cave
Nothing stood out when I took them off so I had no machining done. Cleaned up the block and ran a straight edge over the manifold which look OK. Like I said I threw the gaskets on just for the heck of it. The drivers side is fine it was just the passenger side that did it. Most probably work OK for you. Just helping out so you can make an informed decision. Done about 100miles since bolting it back on without the gasket and there is no leaks.
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