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#1 |
Registered User
Join Date: Aug 2007
Location: Puyallup, Washington
Posts: 63
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Exhaust donut and manifold paint
Hi everybody!
I have a small exhaust leak on the drivers side of my 307 (tick-tick-tick...etc). I think it's coming from the donut gasket. I removed the nuts and slid the flange back. Turned out I had to remove the manifold in order to gain enough play to get the exhaust pipe to drop down. Does the donut kind of "bake" on? How do you get the thing loose? It's the old asbestos type. It's stuck on the end of the pipe right now. Also - as long as I have the rams-horn out, I thought I would have it sand blasted and re-finish it with Duplicolor 1200 degree ceramic containing paint. Will this hold up well or is there another type of finish I should use? Tim |
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#2 |
Registered User
Join Date: Apr 2000
Location: Bonne Terre, Mo
Posts: 3,005
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Re: Exhaust donut and manifold paint
The manifolds & the donut gaskets typically leak after a while. Usually the studs break off too so if they are not in great shape heat them up & replace them. The donut should pry out as far as paint never had much luck keeping 1200 stuff on them either for long periods of time.
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'69 Chevy Long Fleet & '71 GMC Short Step & Project "ODD BALL" "You can wash a pig, soak it in most expensive perfume. In the end it is still just a pig." ODD BALL build thread http://67-72chevytrucks.com/vboard/s...d.php?t=478629" |
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#3 |
Too many projects
Join Date: Mar 2004
Location: Fargo, ND land of the flat hills
Posts: 1,147
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Re: Exhaust donut and manifold paint
POR 15 has a manifold paint that I used 3 years ago on freshly sandblasted manifolds and it still looks great no matter how hard I try and screw it up!
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Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" |
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#4 |
Senior Member
Join Date: Nov 2005
Location: northwestern wi
Posts: 2,111
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Re: Exhaust donut and manifold paint
i have also had exelent results with the high temp por on the headers on my vette 3 years and several thousand miles and still look great. i used the ceramic duplicolor crap on my truck last fall and it looked good til it set this winter and rusted badly both the headers and manifolds were blasted before being coated. por is the best i have found
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common sense isn't so common anymore |
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#5 |
Moderator
![]() Join Date: May 2007
Location: Southern Cal
Posts: 20,004
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Re: Exhaust donut and manifold paint
Use POR 15....period.
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#6 |
Registered User
![]() Join Date: Mar 2008
Location: Kansas City
Posts: 431
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Re: Exhaust donut and manifold paint
I went online and found the POR website. Is there a certain mix for exhaust manifolds or do I just but POR 12 Gray? What about any of the prep chemicals they sell, are they needed?
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![]() ![]() ![]() 1972 GMC Sierra Grande 3/4 Ton 4x4 1970 Mercury Cougar XR7 1943 Farmall M |
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#7 |
Too many projects
Join Date: Mar 2004
Location: Fargo, ND land of the flat hills
Posts: 1,147
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Re: Exhaust donut and manifold paint
There is a specific manifold paint, I found it at a local parts store. You won't need very much, I barely dented the quart can I bought with two pairs of manifolds.
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Andrew 84 GMC C1500 SWB 6.2 Diesel/700R4/3.42 "Grandpa's odd duck" |
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#8 |
Registered User
Join Date: Feb 2007
Location: Houston
Posts: 39
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Re: Exhaust donut and manifold paint
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The puppy barks but the trucks roll along. |
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#9 |
Registered User
![]() Join Date: Mar 2008
Location: Kansas City
Posts: 431
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Re: Exhaust donut and manifold paint
Thanks GMT
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![]() ![]() ![]() 1972 GMC Sierra Grande 3/4 Ton 4x4 1970 Mercury Cougar XR7 1943 Farmall M |
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#10 |
Chasin' the Dream
Join Date: Mar 2008
Location: Lost in the 70's
Posts: 200
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Re: Exhaust donut and manifold paint
This is the POR Manifold Grey that you are talking about?
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Born with a Bowtie ![]() 1971 C/10 350/350 Daily Driver/project Assumption=The mother of all ![]() |
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#11 |
Registered User
Join Date: Feb 2000
Location: Center City, MN, USA
Posts: 3,253
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Re: Exhaust donut and manifold paint
I used Eastwoods brush on manifold paint on my manifolds 4 years ago. Still looks good today.
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'70 cab, '71 chassis, 383, TH350, NP205. '71 Malibu convertible '72 Malibu hard top Center City, MN |
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#12 |
Sierra Grande Club
Join Date: Jan 2007
Location: New Mexico USA
Posts: 2,433
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Re: Exhaust donut and manifold paint
I’m curious to everyone who’s used Duplicolor and had failures, did you bake the manifolds at the proper temp like stated on the can? It says it optional for a more durable finish.
That’s what I did, I’ll have an opinion once I start running it. s/t
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1971 GMC Sierra Grande, 1/2 ton short wide, original 4 bolt 010 020 block & heads. (matching #'s). 383 stroker, SMI q jet 750 cfm, Lunati Voodoo 60102 cam, Scorpion roller rockers, Spin Tech pro street mufflers with X pipe. ![]() Last edited by Sport/Truck; 04-22-2008 at 08:33 PM. |
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#13 |
Registered User
Join Date: Sep 2005
Location: Canton North carolina
Posts: 3,079
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Re: Exhaust donut and manifold paint
The POR stuff is the best, the Eastwood does not compare. I used POR on set of BB manifolds and a set of cheapy headers and both still look great. The eastwood after blasting and prep did not hold up and started flacking off after a little while.
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#14 | |
Hand Crafted C-10
![]() Join Date: Aug 2006
Location: Burien, WA
Posts: 5,180
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Re: Exhaust donut and manifold paint
Quote:
If you can, replace your studs and check the manifold to block area for flatness. Do not use a gasket between the manifold and block....clean both surfaces and bolt up tight. Use lock washers. ...just my .002 worth... Last edited by ETsC10; 04-23-2008 at 04:39 AM. |
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#15 | ||
Sgt. Z
Join Date: May 2007
Location: Minnesota
Posts: 102
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Re: Exhaust donut and manifold paint
Quote:
I have used it on my manifolds from 1967 chrysler 440....that stuff works perfect!!! Highly recomended ![]()
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1967 Chevy SWB 1966 Malibu SS Convertible 355/420hp 700r4 and 373's with eaton posi ![]() Quote:
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