Given up trying to seal the cheap generic block hugger headers on my '50,the mounting flanges are simply too thin and as a consequence have warped.
I've since scored a set of good ole cast iron ramshorns from a friend and ordered yet another pair of gaskets.
As an added bonus it looks like i'll have gained some extra steering clearance too.
I also fully lubed all the new ball joints and steering rod ends too.

1950 Chevy Advance Design 3100 in Scotland
In the Stovebolt Gallery
More pix on Flickr.
I've definately got this truck thing in my blood ... my DNA sequence has torque settings
"Of all the small nations of this earth,perhaps only the ancient Greeks surpass the Scots in their contribution to mankind" Winston Churchill.