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Exhaust Gaskets?? |
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WARBED 
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Joined: Feb/12/2011 Location: Edinburg TX Status: Online Points: 1688 |
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 Topic: Exhaust Gaskets??Posted: Mar/14/2019 at 3:39pm |
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Yea it's been a while maybe 15/20 years since I mentioned stock manifolds didn't use gaskets. I got hammered on that subject. I have had the log type warp especially the left bank off a v8 Pacer but so far I've been lucky on the freeflows. I just installed Hooker comp headers on a 69 Jav with a 72 360 and it was a nightmare. Had to right an article in the engine mod section about the ordeal.
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59 American 2dr S/W. 70 390 AMX. 70 232 javelin. Kelvinator fridge ice cold beer storage.
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Steve_P
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Charter Member Joined: Jun/28/2007 Status: Online Points: 3808 |
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Posted: Mar/14/2019 at 1:42pm |
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I've never seen a used exhaust manifold from a virgin engine that was flat across the three planes. Once they heated up they stress and when they're first unbolted they move.
It's been pointed out many times here that there were no exhaust gaskets from the factory. |
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WARBED
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Joined: Feb/12/2011 Location: Edinburg TX Status: Online Points: 1688 |
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Posted: Mar/14/2019 at 8:30am |
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Finally after years of saying AMC didn't use exhaust manifold gaskets and since I had the Factory parts book and no gaskets were listed except in the group 19 section, I see that some are in agreement. AMC manifold very very rarely warp but once you run gaskets you will all ways have to use gaskets. Even on a good set of headers I have never ran gaskets, just made sure the flange was true and flat. Headmen don't fit into this category.
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59 American 2dr S/W. 70 390 AMX. 70 232 javelin. Kelvinator fridge ice cold beer storage.
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Trader
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Joined: May/15/2018 Location: Ontario Status: Offline Points: 6912 |
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Posted: Feb/12/2019 at 6:31pm |
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One Bad Rambler, you must have good oak or a place with good humidity control. I find using a piece of float glass works very well for checking flat and lapping. An old large coffee table with a piece of 5/8" glass. My buddy uses a piece of granite from a broken kitchen counter top.
DON"T bring car parts into the kitchen. Last time I was caught with pistons in the dishwasher it was pure heck! If you take your time with a file and then grades of paper, you can get old manifolds flat yourself. I find some machine shops not very good at setting up properly to machine the faces and you get back worse then what you send out.
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MagentaMan
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Joined: Dec/26/2017 Location: Eatonville,Wa Status: Offline Points: 6 |
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Posted: Feb/11/2019 at 11:07pm |
Remflex are the BEST exhaust gaskets I have ever used!
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FSJunkie
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Joined: Jan/09/2011 Location: Flagstaff, AZ Status: Offline Points: 4742 |
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Posted: Feb/11/2019 at 10:51pm |
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If a non-warped manifold that would seal without a gasket is used with a gasket, it will soon become warped or pitted and require a gasket forever.
Getting a machine shop to PROPERLY reface a manifold or head to not require gaskets is near impossible. They often screw things up worse. The bad news is a warped manifold or head without a gasket will leak, but the leak won't usually get worse unlike a gasket blowing out. I try to get away without gaskets if possible. Otherwise, Remflex gaskets. I blow out all other kinds of gaskets with my heavy right foot. |
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1955 Packard
1966 Marlin 1972 Wagoneer 1973 Ambassador 1977 Hornet 1982 Concord D/L 1984 Eagle Limited |
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bigbad69
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Joined: Jul/02/2007 Location: Ottawa, Ont. Status: Offline Points: 6685 |
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Posted: Feb/11/2019 at 10:24pm |
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Manufacturers (AMC was not the only one) did not use exhaust gaskets because the parts were new and true. Exhaust manifolds have a tendency to warp because of the excessive heat. The leaks manifest during the removal and replacement of the manifold. That is why gasket kits include exhaust gaskets. Do all manifolds warp? No. Can the manifolds be machined true again? Yes, but gaskets are cheaper. The answer to the question about whether to use or not use the gaskets on your engine is simple. Don't use them. If you find there are exhaust leaks, then put the gaskets on. Some will argue there is better flow without the gaskets, and they are correct. However, on a street driven car using factory exhaust manifolds, the difference will be negligible.
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69 Javelin SST BBO 390 T10
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one bad rambler
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Posted: Feb/11/2019 at 9:28pm |
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A stiff board (Oak)and some 120 grit across the head surface and the same across the manifold if all is true your good to go
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 68 AMX 390 4 Speed,68 American,64 American 2 Door Wagon Altered Wheelbase,78 Concord Build 360,727,8.8
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73amx
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Joined: Aug/16/2016 Location: Michigan Status: Offline Points: 46 |
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Posted: Feb/11/2019 at 9:03pm |
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Thank you all. I appreciate the feedback! Mike
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Bill Mitchell
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Joined: Jul/12/2011 Location: St Matthews, SC Status: Offline Points: 340 |
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Posted: Feb/11/2019 at 3:29pm |
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I have rebuilt several AMC's and have not used gaskets. Works fine. Personal choice I think.
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Bill Mitchell
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FSJunkie wrote: