| Hi Andy,
Gaskets eventually take a set after enough heat & time & lose their 
resiliency. The fact that you have very old sealer must mean that the 
gasket is very old also. I glue the gasket to the head with a permanent 
type sealer & use "Hylomar HPF" on the top side to permit easy removal 
of the cover & reuse of the gasket which stays intact on the head.
Dave Russell
BN2
andy65 wrote:
> Am getting some oil leakage around the rear of the valve cover 1965 BJ8.
> What's your experience in stopping leaks there?  Do you use gasket sealer?
> Just on bottom the valve cover gasket or top and bottom?   What type?
> 
> Oil pressure is good and am not burning oil so I think the rockers are ok.
> I have admittedly very old sealer on the bottom of the gasket only.
> 
> Andy
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