The only reason to replace an exhaust manifold is if it is broken, warped, or cracked. Those used in our cars were of high quality, and I have never seen one that was warped. They can become broken for various reasons, but not generally from simply being used. If the smoke isn't accompanied by exhaust noise, the problem isn't likely to be the exhaust manifold. If it is, it is more likely the gasket, which can rupture from incorrect tightening of the fasteners. Cracks and fractures are pretty obvious, visually.
Some of the older cars utilized an internal heat tube to activate the automatic choke. This can deteriorate, leading to the need for a replacement manifold to correct that condition. Even in that case, replacements are not readily available, and usually the problem is corrected in some other way. Others contain a manifold heat control valve which usually can be repaired. It would help to know what year car you are working on.
If all you are seeing is smoke, the valve cover gasket is probably leaking oil, which is running over the exhaust manifold and burning up. Gaskets are readily available for nearly all years of Imperials. This would not require or suggest that the manifold should be replaced.
Paul W.
-----Original Message-----
From: Hardrick, Brian <HardrickBG@xxxxxxxxxxxx>
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Tue, 20 Jun 2006 17:37:02 -0500
Subject: RE: IML: Re:'64-66 Q: was dual-AC an option?
All,
I seek the expertise of my fellow Imperialist. I would like to know how
risky it would be to purchase an exhaust manifold from a salvage yard.
The reason that I ask this question is that I plan on doing so because I
have smoke coming from that area and I figured I would need to change
the manifold. If anyone has any other suggestions on what type of issue
I could have please advise.
-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of K. Eric Wolfe
Sent: Monday, June 19, 2006 9:50 PM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: RE: IML: Re:'64-66 Q: was dual-AC an option?
AC was an option ($452.25) while dual air was ($636.15)
Source Standard Catalog of American Cars, Page 249
-----Original Message-----
From: mailing-list-owner@xxxxxxxxxxxxxxxx
[mailto:mailing-list-owner@xxxxxxxxxxxxxxxx] On Behalf Of WCR
Sent: Monday, June 19, 2006 9:42 PM
To: mailing-list@xxxxxxxxxxxxxxxx
Subject: RE: IML: Re:'64-66 Q: was dual-AC an option?
Our '64 Crown 4DHT came with dual A/C units.
Have a '66 Crown 4DHT with no A/C at all, seems strange.
Bill Roddick
http://www.rocknrod.com/states/washington.htm
http://allaroundmopars.com
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