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  #11  
Old 10-24-2012, 03:23 PM
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When someone can explain to me why a stiffer plate is needed (I've never replaced one since this design came out), I might be inclined to think this is a good deal. The problem was that the original gaskets were made of paper (or something similar). Replacements are made of metal and once correctly installed, never wear out.
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Old 10-24-2012, 11:08 PM
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Stiffer is always better.
Anyway, never say never. I guess the OEM steel-reinforced rubber gaskets were all installed incorrectly at the factory then because they're blowing left and right. It's an awful design. Cheaper and faster to make, but badly flawed. Even the car magazine guys did a low buck repair using two of the OEM metal plates for added rigidity. However, the intake manifold is not steel. Aluminum, I believe. Clamping a steel plate to an aluminum manifold, where the heat and constant vacuum dynamics of an engine are present is just begging for problems. Every heat cycle sets up a stress on the gasket since steel and aluminum expand and contract at different rates. Over time it adds up. The thick aluminum plate makes sense. The stocker will last.....if you drive like pawpaw. Actually, my preferred method of fixing the problem is ditching the keg altogether, but that costs considerably more.
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Old 10-25-2012, 08:04 AM
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Quote:
Originally Posted by Gen1dak View Post
Stiffer is always better.
Anyway, never say never. I guess the OEM steel-reinforced rubber gaskets were all installed incorrectly at the factory then because they're blowing left and right. It's an awful design. Cheaper and faster to make, but badly flawed. Even the car magazine guys did a low buck repair using two of the OEM metal plates for added rigidity. However, the intake manifold is not steel. Aluminum, I believe. Clamping a steel plate to an aluminum manifold, where the heat and constant vacuum dynamics of an engine are present is just begging for problems. Every heat cycle sets up a stress on the gasket since steel and aluminum expand and contract at different rates. Over time it adds up. The thick aluminum plate makes sense. The stocker will last.....if you drive like pawpaw. Actually, my preferred method of fixing the problem is ditching the keg altogether, but that costs considerably more.
At the risk of being argumentative, the factory gaskets were not steel reinforced rubber. Why they used a paper gasket is beyond me but I'm not an engineer.
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Old 10-25-2012, 01:44 PM
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^^Actually is an Engineer

What is the intake manifold made out of?

What is the belly pan made out of?

Do you know what CTE is? Coefficient of thermal expansion. Different metals have different rates. Now remind me again what the answer was to the first two questions?

The various heat cycles the gasket has been through, along with differing CTE's is the major cause of the gasket failure. Same idea with an iron block and aluminum head, and a single layer gasket (bad). Remember the Dodge/Plymouth 2.0 head gasket issue? The Ford 3.8 HG issue? Wonder what the reason was?

That's why the Hughes kit is a good idea. But - you can do what you want.

My 3.9 got the Hughes equivalent kit when I did the repair. I never had to do it again.
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Old 10-25-2012, 09:27 PM
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Quote:
Originally Posted by RamTech View Post
At the risk of being argumentative, the factory gaskets were not steel reinforced rubber. Why they used a paper gasket is beyond me but I'm not an engineer.
This is what the rubber ones look like when they blow.
http://www.hughesengines.com/Index/p...p?partid=27091
You may not have ever seen one fail, but you might also consider that maybe by the time it got to the point of failure again it had been traded off or junked. As stated, drive moderately and it'll hold up, but get spirited and it will not last.
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