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Cometic MLS - copper coat or not....


2eighTZ4me

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They are recommended dry, but I've heard of them leaking when installed dry if the machined surfaces aren't exactly right.  The quick fix in those cases is using a new cometic gasket with copper spray.  

 

I know of plenty of builds where a light coat was used on new gaskets with no issues.  Certainly seems like added insurance.

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Hey Ryan - yeah - I've done it in the 'past' 2x with the old gasket - but never had the installation card, so I didn't know they recommended a dry install. My surfaces are completely within spec - head went to the machine shop and cleaned/straight edged and deemed worthy by my machinist, so I can't help but think that this is just added insurance. Thank you sir!

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  • 1 month later...

The copper spray is fantastic on any head gasket.  It's not a matter of "sealing" the gasket.  The copper's specific heat is lower than carbon steel, so most of your heat from the head will be transfered AROUND the gasket and not through it, making your gasket's heat capacity much higher....spray the crap out of it is what I say.

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