There are different blends of cork gaskets that last much longer than 100% cork. A 3/16 to 1/4" thick cork /nitrile rubber (Buna N) blend will last for years and look correct. The material is not low cost, around $45 for a piece 42" x 12", which is why plain cork was used at a cost of $18. Six valve cover gaskets can be cut from a sheet this size, which equates to $7.50 vs $3 in material costs. This is , according to one website, surplus material and is deemed low cost.
http://www.ramgaskets.com/gasket-materi ... -material/
An all rubber nitrile rubber sheet costs $17 per gasket, and is special order since you need a softer, 40 durometer blend to effect a proper valve cover seal.
Add in labor, stocking charges , overhead, and you see why costs are even more.....
I prefer the nitrile rubber 40 duro as , once it is in place, it lasts forever....and can be reused time and again as it does not take a 'set' like the cork gaskets.
Cheers, Lee Jacobsen, Dearborn, MI TC0780
-----Original Message-----
From: 'Bruce Doran-Veevers'
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Sent: Sat, Nov 7, 2015 5:11 pm
Subject: [mg-tabc] Valve Cover Gasket
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Is there a gasket material other then cork available ? Bruce Doran-Veevers MBS Sales & Marketing Ltd. 115 Hemlock Dr. Carleton Place, Ont. K7C 3P2