what type of gasket are you using?  You can get what looks like the right
gasket for the exhaust pipe that is actually for a carb... same size same
shape, but the carb gasket is made out of paper-like material, where and
exhaust gasket is made out of two piece of stamped metal with some mystery
material between them.  I made the mistake once of using the wrong gasket
material.
-good luck
-Matthew

Matthew Pollard          "Racing with the wind and flirting with death
Dept. Of Chemistry        So have a cup of coffee and catch your breath"
University of Idaho
www.uidaho.edu/~poll7356

On Mon, 5 Nov 2001, Cookson, Noel wrote:

> Hi,
>
> I have a recurring problem with the gasket for the #1 cylinder header pipe.
> This gasket fails after running the car at highway speeds for an hour or
> more. Around town use has not caused a problem.
>
> I have replaced this gasket twice now and even doubled it up to try to
> accommodate any warping that might occur as things heat up. Has anyone else
> seen this problem? Is there another/better gasket I should look for?
>
> Noel
>
> 88 GL
>