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Old 09-30-2006, 10:14 PM   #1 (permalink)
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390 exhaust manifold gaskets

Has anyone tried header exhaust gaskets? I need to replace my stock gaskets which have burned up and I wonder if there is anything better. Also, seems my right and left exhaust manifolds have different gaskets. The right has a flat gasket and the left a donut. Is anyone familiar with the flat gasket and how to replace it?
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Old 09-30-2006, 10:24 PM   #2 (permalink)
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390 exhaust manifold gaskets

Header gaskets might help temporarily but if manifold surface is rough and not true, a surface grind is in order. As far as the flat gasket, that is meant to mate with the flat side of the heat riser. The other side of the heat riser uses a "donut". Is your heat riser there, or is it missing?


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Old 09-30-2006, 10:33 PM   #3 (permalink)
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390 exhaust manifold gaskets

Im pretty sure there is suppose to be donuts gaskets on each side into the collector.

the manifold gaskets - i got some FPA headers and they came with these really thick gaskets you may be able to buy them seperately

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Old 10-01-2006, 07:13 AM   #4 (permalink)
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390 exhaust manifold gaskets

Exhaust gaskets in general are supposed to live many years. If there is a leak due to poor alignment, warping or loose bolts, fix that first. The built up exhaust gasses create a pressure, then create a jet of hot air, which in turn creates a groove then a blown hole (and noise). Once flattened and fixed, the replacement gaskets will last even longer.

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Old 10-01-2006, 04:41 PM   #5 (permalink)
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390 exhaust manifold gaskets

Thanks. I will check the surface of the manifolds. Being cast iron I doubt they have warped.
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Old 10-01-2006, 05:41 PM   #6 (permalink)
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390 exhaust manifold gaskets

390 log style manifolds warp, believe it. Also even the port surfaces on the head can get pitted with age. I've heard of people using a soft copper gasket that can crush a bit to take up some of the irregularities but I have no experience personally so "caveat emptor" Stu
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Old 10-02-2006, 11:59 AM   #7 (permalink)
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390 exhaust manifold gaskets

Where does one get the copper gaskets? Regular parts store?

My Galaxie will not hold a tight seal even after applying some of the products designed to provide a good seal.

Can anyone recommend a sealing product that might last more than a few thousand miles?
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Old 10-02-2006, 02:51 PM   #8 (permalink)
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390 exhaust manifold gaskets

My 64 developed an exhaust leak. After doing a little web research, it seems that a gasket was not fitted from the factory.
I removed the bad gasket, cleaned the surfaces and re-installed the manifold using Ultra Copper RTV. That was about 6 months ago and it is still not leaking.
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Old 10-03-2006, 05:25 AM   #9 (permalink)
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390 exhaust manifold gaskets

64squire

what is ultra copper rtv?

Is it a brand of gasket, or is it something that you apply over the surfaces to be sealed?
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Old 10-03-2006, 05:42 AM   #10 (permalink)
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390 exhaust manifold gaskets

Ultra Copper RTV is "copper silicone" chaulking for lack of a better description. Look in the parts store where you'd buy gasket silicone in a tube etc. RTV just means "room temperature vulcanizing" As for the copper gaskets I'm not sure where one might get them maybe a speed shop or Summit etc. Good Luck. Stu
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Old 10-03-2006, 10:35 AM   #11 (permalink)
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390 exhaust manifold gaskets


Her is a link to copper gaskets at Summit.
http://store.summitracing.com/egnsea...287+4294925082

and Permatex Ultra Copper
http://www.permatex.com/products/aut...sket_Maker.htm
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Old 10-05-2006, 11:25 PM   #12 (permalink)
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390 exhaust manifold gaskets

Has anyone used remflex gaskets on stock manifolds?
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Old 10-06-2006, 01:47 PM   #13 (permalink)
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390 exhaust manifold gaskets

Like CaptV says, make sure they are square and flat. Check them with a straight edge. I had to plane both of mine at a machine shop because I couldn't get them to seal. Previous owner doubled up on the gaskets to get them to seal. That worked for a couple years, until they blew out and I had to fix them properly.

Also, spray the outside with that grey graphite dry lubricant stuff just prior to installation. It won't burn off like paint and makes the manifolds look like new cast iron!

<font size=-1>[ This Message was edited by: Gordo on 10/7/06 2:06pm ]</font>
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