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03-21-2024, 12:00 PM
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#1 |
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Registered User
Join Date: Jan 2024
Location: EL PASO
Posts: 205
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Old Style "Rams Horns" Exhaust Flange Donut Gasket
My exhaust manifold does have a small rim about half an inch down inside the outlet to exhaust pipe.
I've noticed that some exhaust flanges have a metal collar built into them. I put your typical donut in there (no collar) and it still sounds like it's got a leak. Yeah I did put new nuts and bolts and kept cranking on them but it still sounds like there's a leak and the gasket to head is new. I'm pretty sure it's that donut... What do you all use on those old rams horns? TIA |
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03-21-2024, 02:06 PM
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#2 |
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Registered User
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,998
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Re: Old Style "Rams Horns" Exhaust Flange Donut Gasket
I used a donut with a collar. No leaks after a couple of years.
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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03-21-2024, 03:35 PM
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#3 |
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Senior Member
 
Join Date: May 2006
Location: Philadelphia, Pa. 19454
Posts: 9,784
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Re: Old Style "Rams Horns" Exhaust Flange Donut Gasket
New studs and brass nuts works best at drawing the two pipes together and new collars
I've tried the non sleeve type, but the metal sleeve seems to me work best
__________________
Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim Last edited by jaros44sr; 03-21-2024 at 06:41 PM. |
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03-21-2024, 08:22 PM
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#4 |
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Who Changed This?
Join Date: Jan 2013
Location: Simi Valley, CA
Posts: 10,790
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Re: Old Style "Rams Horns" Exhaust Flange Donut Gasket
At the age of the manifold, it may well be pitted enough to allow a leak, even with the doughnut. I had a Buick like that, and used some exhaust system sealer. Of course, it was metal to metal, (which gaskets still didn't help). I got it at O'Reillys.
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~Steven '70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper Simi Valley, CA |
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03-22-2024, 11:19 AM
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#5 |
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Senior Member
Join Date: Mar 2003
Location: Colfax-California
Posts: 8,679
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Re: Old Style "Rams Horns" Exhaust Flange Donut Gasket
Are you sure it is not leaking at the cyl head in the center? Was the manifold flat when you installed it?
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03-25-2024, 01:56 AM
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#6 |
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Registered User
Join Date: Jan 2024
Location: EL PASO
Posts: 205
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Re: Old Style "Rams Horns" Exhaust Flange Donut Gasket
I think I got it. I smoothed out (to 1000 grit) head to to manifold and manifold to tailpipe surfaces and torqued down. It kind of sounds like I got it. Once I get those crappy flow masters that the "artist" put on there thrown away I'll be able to hear better what's going on...
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