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Somatic Negative Optimist
Join Date: Mar 2002
Location: Winlaw, BC, Canada
Posts: 7,206
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Depends on the condition of the gasket.
The nuts are "Nyloc" meaning: the nylon acts as a seal and locks the nut.
The Alu washers are designed to crush and thereby seal.
I have re-used the same ordinary gasket for the last 3 years (2-3 valve-adjust) because I do things a little different:
Many years of industrial applications taught me that any gasket will work as long as the mating surfaces are clean AND we lubed both sides of the gaskets with oil or antiseize.
Years ago, on my first valve adjust, I cleaned the surfaces real thorough, then I greased both sides of a regular gasket set with "Neverseize" and torqued from the center out.
With the antiseize on both sides of the gasket, you'll never have to worry about sticky old gaskets and cleaning the mating surfaces.
My bottom valve covers are the turbo ones and not warped.
And yes, I have at times re-used old washers and nuts.
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1980 Carrerarized SC with SS 3.2, LSD & Extras. SOLD!
1995 seafoam-green 993 C2, LSD, Sport seats. 
Abstract Darwin Ipso Facto: "Life is evolutionary random and has no meaning as evidenced by 7 Billion paranoid talking monkeys with super-inflated egos and matching vanity worshipping illusionary Gods and Saviors ". 
Last edited by Gunter; 11-30-2006 at 08:42 AM..
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