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The 4 notch pins that the rubber seals go round are they sitting lower than the gasket ?? Just a thought .
And David silvers has got 2 genuine head gaskets in stock for the F2
If you're talking about the little rubber sleeves that fit round the dowels, F2 engines should only use 4, seems like your gasket kit was generic aftermarket, as F1's and K7's use all 8.