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270 HEMI EXHAUST FLANGE
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Burnemup
Posted 2020-06-02 10:33 AM (#599110)
Subject: 270 HEMI EXHAUST FLANGE



Veteran

Posts: 104
100
Location: Simi Valley, CA
I keep blowing the passenger side exhaust flange gasket on my 1955 Dodge 270 Hemi. I have tried different brand gaskets and about every 3 months or so they blow out. All the flange gaskets I get are the metal type, they don't look like the old traditional type. I have tried putting two together and still they blow out. The next thing to do is to remove the exhaust manifold and have the gasket surfaces resurfaced flat.

Does anyone have any other advice?

Thanks,

Ernie
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56D500boy
Posted 2020-06-02 11:46 AM (#599117 - in reply to #599110)
Subject: RE: 270 HEMI EXHAUST FLANGE



Expert 5K+

Posts: 6118
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Location: Lower Mainland BC
.
Ernie: I kind of have the same issue on my 56 D500 315 hemi but on the driver's side. The tranmission shop had to drop the exhaust on that side during my Powerflite to Torqueflite swap to get the rear cross-member out. They did so by disconnecting the exhaust down pipe from the exhaust manifold. I presume that the OE gasket was toast so they put something new back in. But it is NOT the same size and I have a leak right at the flange which is annoying. I dropped the down pipe and tried to find a correct gasket but the ones I could find were NOT correct so I was forced (for the time being) to re-use the gasket that the trans shop used.

After reading your story, the firs thing that came to mind for you (and for me) would be red RTV silicone sealant. The same stuff that is used by fireplace people.

Might not be good enough but it might be (I think that I will try it - coating both sides of the gasket and letting it set up before re-installing):

"* Temperature range of -65F to 650F intermittent
* Suggested Applications: Valve covers, oil pans, timing covers, water pumps, thermostat housings, transmission pans "

https://www.amazon.ca/Permatex-81409-High-Temp-Silicone-Gasket/dp/B0...

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Burnemup
Posted 2020-06-02 4:40 PM (#599128 - in reply to #599110)
Subject: Re: 270 HEMI EXHAUST FLANGE



Veteran

Posts: 104
100
Location: Simi Valley, CA
I found a web site called "Vintage Gasket Co" 241-542-3713 info@vintagegasket.com . I'm going to get a couple of the traditnional style gaskets and put two together and doublenut them to hopefully keep it from loosing up.
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geoffs60
Posted 2020-06-02 5:37 PM (#599131 - in reply to #599110)
Subject: RE: 270 HEMI EXHAUST FLANGE


Regular

Posts: 70
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Location: christchurch New Zealand
I have generally found it will be a warped front pipe flange,adding additional gaskets can worsen the problem long term.
Geoff
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22mafeja
Posted 2020-06-03 2:47 AM (#599144 - in reply to #599110)
Subject: RE: 270 HEMI EXHAUST FLANGE


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Posts: 172
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Location: Finland
You might fix it with a donut type of gasket but you have to put a pipe stump inside the exhaust pipe to keep the donut centered.
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Burnemup
Posted 2020-06-04 10:35 AM (#599190 - in reply to #599110)
Subject: Re: 270 HEMI EXHAUST FLANGE



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Posts: 104
100
Location: Simi Valley, CA
I just tried to fix again with a old style gasket and a new style metal gasket. I was going to double nut the bolts but since the bolts go up there is very little room to try that. The manual says the flange bolts should be torqued to 40 ft lbs, but I have limited room and was only able to use two boxed end wrenches to tighten. I hope this works.
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normsclassicradio
Posted 2020-06-04 11:21 AM (#599228 - in reply to #599110)
Subject: RE: 270 HEMI EXHAUST FLANGE



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Posts: 246
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Location: Kalispell, MT USA
In the early 90's GM had techs use this on 454 manifolds. Cures hard as stone. I have used this when splicing exhaust pipe with wide band clamps.



(WALKER EX SEAL.jpg)



Attachments
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Attachments WALKER EX SEAL.jpg (58KB - 13 downloads)
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Burnemup
Posted 2020-06-20 12:02 PM (#599903 - in reply to #599110)
Subject: Re: 270 HEMI EXHAUST FLANGE



Veteran

Posts: 104
100
Location: Simi Valley, CA
I just read about a guy with a Studebaker having the same problem. He said to use the old style gasket and use the copper spray gasket sealer like they use on head gaskets and use brass nuts and also use a sanding block to clean both the manifold and flange surfaces to to improve the flatness for a better seal. Any thoughts on this method?
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57chizler
Posted 2020-06-20 1:12 PM (#599905 - in reply to #599903)
Subject: Re: 270 HEMI EXHAUST FLANGE



Expert

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Location: NorCal
A straight edge on the pipe and manifold flange will show any distortion. If there's any visible distortion, it's unlikely a sanding block will correct it. I think the "miracle in a tube" is your best bet.
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