Rebuilt yz250f weird noise

So I just rebuild my yz250f with a brand new piston rings and seats cut in head and ss valves. I got it together and it started up first kick but there is a awful noise coming from the right side of the engine it's almost like a rattle. I'm missing the gasket that goes between the header and head could that be it? My timing seems to be spot on and the power seems all there. I am ordering the part but wondering if it is likely something else that I'm completely missing

seems like the gasket to me

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