[jjzepplin]

I always file down the raised portion to be flush with the flange on the header itself. Then I make a relief cut on the flange between the first port and rear port leaving 3 separate bolting flanges. Then I use an aluminum gasket made by "Percy's". No leaks. I also use "Percy's" Flange gaskets. I also like to use the longer header bolts for the head. I made a special wrench for fitting the harder to get to bolts. A 1/4" drive socket and extension help to get in there too. A lot of work but the pay off is nice and maintenance free.