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#2428428 - 01/03/18 04:03 PM 71 340 exhaust manifold bolts
5carguy Offline
top fuel

Registered: 01/18/06
Posts: 1858
Loc: Lee Co. Fla.
Who has the best and most correct hardware for exhaust manifold install on a 71 340 Cuda?Thanks in advance

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#2428524 - 01/03/18 07:11 PM Re: 71 340 exhaust manifold bolts [Re: 5carguy]
69bfan Offline
enthusiast

Registered: 12/16/05
Posts: 212
Loc: Georgia
AMK Products out of Winchester, VA. Part Number C-8023.
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Correct Mopar weatherstripping is our specialty, but we stock and supply a wide assortment for all of your restoration needs.

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#2428874 - 01/04/18 11:00 AM Re: 71 340 exhaust manifold bolts [Re: 5carguy]
Dibbons Offline


Registered: 01/11/15
Posts: 71
Loc: California, United States and ...
I purchased a kit online but have a question/observation. My factory stock '65 273 vehicles and my factory stock '72 318 vehicle did not have the special round washers on the two middle-inner bolts. The rounded washers were only installed on the two outer studs and on the two other bolts closer to the studs (total of four washers on each manifold). The on-line kit I purchased included washers for all bolt locations (total of 12-for both sides).

My understanding is the washers allow for expansion and contraction of the exhaust manifolds as they cycle through heating and cooling (running and non-running conditions). It seems the expansion between the inner two bolts was not deemed sufficient enough by the factory to warrant inclusion of the round washers at those locations (although I can't see how it could hurt anything to include the washers under all bolt locations). In other words, "factory correct" installation would mean four washers on each side and no washers on the inner two bolts locations, right? (But I am not saying that factory correct is important in this case).

Anyone have any other pertinent information to my comments/observations? Thank you.

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#2428904 - 01/04/18 12:08 PM Re: 71 340 exhaust manifold bolts [Re: Dibbons]
Cab_Burge Offline
I Win

Registered: 08/23/03
Posts: 30939
Loc: Bend,OR USA
I'm going to say that all the stock 340 motors I took apart, A and E body, had those washers on all locations, studs or bolts shruggy
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#2429336 - 01/05/18 01:52 AM Re: 71 340 exhaust manifold bolts [Re: 5carguy]
kentj340 Offline
pro stock

Registered: 03/04/11
Posts: 1336
Loc: Houston
I'm the original owner of a '69 Barracuda 340 that I ordered in the fall of '68. Recently I removed the manifolds for the first time and took photos. Factory was 2 thick conical washers at the front and 2 at the rear with no washers in the middle 2 places. So yes, four washers on each side and no washers on the inner two bolt locations.

These photos are left side: front, middle, middle, and rear. Right side is the same as far as conical washers.

And AMK is the best source. AMK has actual size color photos of each item they sell, so you know exactly what they offer. Items that are exact copies of Mopar fasteners are coded with the pentastar logo and show the Mopar part number. Others who sell fastener kits are mostly just re-selling AMK.


Attachments
11 Exhaust manifold L front.jpg

11 Exhaust manifold L mid.jpg

11 Exhaust manifold L mid2.jpg

11 Exhaust manifold L rear.jpg


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#2429421 - 01/05/18 10:19 AM Re: 71 340 exhaust manifold bolts [Re: 5carguy]
Dibbons Offline


Registered: 01/11/15
Posts: 71
Loc: California, United States and ...
Those rusty original bolts prove my point perfectly. Thank you.

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#2429662 - 01/05/18 07:44 PM Re: 71 340 exhaust manifold bolts [Re: Dibbons]
69bfan Offline
enthusiast

Registered: 12/16/05
Posts: 212
Loc: Georgia
The AMK kits are retailed through some vendors and then there are similar kits that put together from a variety of parts that I feel are not of the quality of the OEM parts. So just try to determine what your purchasing to avoid any frustrations.
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www.restorationpartsandmaterials.com
Correct Mopar weatherstripping is our specialty, but we stock and supply a wide assortment for all of your restoration needs.

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#2429766 - 01/05/18 11:50 PM Re: 71 340 exhaust manifold bolts [Re: 69bfan]
dart4forte Offline
I Live Here

Registered: 01/31/03
Posts: 14275
Loc: Mesa, Arizona
Those cone washers are getting hard to find

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#2429780 - 01/06/18 12:53 AM Re: 71 340 exhaust manifold bolts [Re: Dibbons]
Dave Hall Offline
top fuel

Registered: 01/21/08
Posts: 1919
Loc: Cotati, CA
I know it might be from the factory like that but logically it makes ZERO sense if the washers are for expansion/contraction? Wouldn't the Siamese port with only two bolts need it? Maybe a little more than the others? The studs make sense.

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#2429838 - 01/06/18 08:46 AM Re: 71 340 exhaust manifold bolts [Re: 5carguy]
Dibbons Offline


Registered: 01/11/15
Posts: 71
Loc: California, United States and ...
I think the factory exhaust manifold gaskets were metal, at least on the early vehicles. This would allow some slip/expansion just like the newer "shiny" side gaskets do. Could be the washers are not related to expansion. Where are all the Chrysler engineers/blueprinters anyway? Don't remember finding anyone with those qualifications on any Mopar Forum. Are they all sworn to secrecy or something? Weird.

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#2429872 - 01/06/18 09:51 AM Re: 71 340 exhaust manifold bolts [Re: Dibbons]
bboogieart Offline
master

Registered: 01/12/08
Posts: 3551
Loc: Lost and Spaced
I don't recall the factory using gaskets.
Doesn't mean they didn't though.
My guess, the heavy solid center section stays put, but the long thinner arms to the outside would be more prone to expansion and movement.
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#2435463 - 01/16/18 01:55 AM Re: 71 340 exhaust manifold bolts [Re: 5carguy]
kentj340 Offline
pro stock

Registered: 03/04/11
Posts: 1336
Loc: Houston
340 exhaust manifold gaskets from the factory: driver side had the heat shield/gasket. Passenger side - no gasket.

Concerning the thick conical washers on 340, there were 4 on the driver side but only 2 on the passenger side. Photos above are the left side showing 4. Photos below are the right side showing only 2, front, middle, rear.


Attachments
11 Exhaust manifold R front.jpg

11 Exhaust manifold R mid.jpg

11 Exhaust manifold R rear.jpg


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#2435574 - 01/16/18 09:52 AM Re: 71 340 exhaust manifold bolts [Re: 5carguy]
Dibbons Offline


Registered: 01/11/15
Posts: 71
Loc: California, United States and ...
Those inner bolts in fotos #1 and #3 look a little weird, like they slipped inside the manifold or something.

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#2435949 - 01/16/18 07:19 PM Re: 71 340 exhaust manifold bolts [Re: 5carguy]
kentj340 Offline
pro stock

Registered: 03/04/11
Posts: 1336
Loc: Houston
They are recessed quite a bit. Special long bolts.
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#2437491 - 01/19/18 11:48 AM Re: 71 340 exhaust manifold bolts [Re: 5carguy]
kentj340 Offline
pro stock

Registered: 03/04/11
Posts: 1336
Loc: Houston
Here's the assortment of 340 exhaust manifold bolts from the factory in order - only 6 thick conical washers.

Top of photo is front, bottom is rear.


Attachments
P1040834.jpg


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If you don't see two dolphins, you need a vacation.

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#2437493 - 01/19/18 11:58 AM Re: 71 340 exhaust manifold bolts [Re: kentj340]
kentj340 Offline
pro stock

Registered: 03/04/11
Posts: 1336
Loc: Houston
Hundreds of times I have soaked fasteners in vinegar for usually 2 - 3 days, and I usually hand wire brush each day to physically remove rust residue in order to speed up the chemical reaction. Works every time, and the fasteners are then ready for phosphating (Parkerizing) or zinc plating.

These exhaust manifold bolts have minor cosmetic pitting, but are serviceable.


Attachments
P1040835.jpg

P1040836.jpg

P1040837.jpg


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If you don't see two dolphins, you need a vacation.

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#2437638 - 01/19/18 05:17 PM Re: 71 340 exhaust manifold bolts [Re: kentj340]
Dave Hall Offline
top fuel

Registered: 01/21/08
Posts: 1919
Loc: Cotati, CA
The casting on that valve cover rail is hideous! That sucker leaked from day one... All the factory correct resto guys should be building leakers! stirthepot

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