I will try some thicker header gaskets.. just didnt think about that becasue when this pipe was new, 2 years ago or so, it fit and worked just fine on a speed motor... not the same motor now, but still a speed, and just cant get it to seal... will try the thicker gaskets you said.... if still doesnt fit, will just find a new header that fits... thanks for your replies and thanks for the PM replies also..