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So this weekend I found out I have a blown header gasket...
Hedman Headers on a mainly stock L82 (1978)
How brutal of a job is it to change a header gasket? Can I do it without removing the headers completely out out of the engine bay? Basically just sliding old gasket out, new gasket in?
If you get lucky and the old gasket comes out easy, then you can do it without pulling the header.
If the current gaskets are the pressed paper type, you will probably have to pull the header so that you can scrape the old gasket material off of the sealing surface.
If you have to pull the header, it's worth while to lay a straight edge on the sealing surface to make sure its flat.