Cork versus rubber for valve cover gaskets


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Old 10-16-11, 09:43 PM
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Cork versus rubber for valve cover gaskets

Any opinions & experience on using cork versus rubber valve cover gaskets on GM 307 cu in V8 engines? Or use neither and replace with silicone gasket maker?
 
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Old 10-17-11, 06:18 AM
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I have a cousin who owned a few shops before he retired and he preferred cork.

Gasket maker works fine but it takes more effort.
 
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Old 10-17-11, 06:51 AM
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GM tried using RTV on the valve covers but soon went back to gaskets. Cork gaskets bleed and rubber slides easily,guess its just personal prefference.
 
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Old 10-17-11, 12:45 PM
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Back in the day, when I spent almost as much time under the hood, as I did behind the wheel. I used rubber valve cover gaskets. You could use them more then once, and it seemed like I was always adjusting my lifters. Then some one came out with screw in studs and they didn't need to be adjusted as much. Then I went with anti-pump up lifters, and stop adjusting all together.
 
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Old 10-17-11, 01:06 PM
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Same here as what Edward said. Also found out that rubber didn't seem to work as well with stamped steel covers, OK with cast aluminum...prob do to flexing and such.
 
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Old 10-17-11, 06:08 PM
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rubber. well, it's silicone rubber nowadays. doesn't crack. i still put a dab of RTV on mating surfaces. Allows to position gaskets better and keeps them in place. Seals micro openings.
 
 

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