tiny tiny bit...i wouldn't put it on..save your $
To my mind, the big advantage to having a thick plastic gasket is not its heat resistance quality, but its ability to cushion and conform to irregularities and dis-similar ecpansion rates between the head and the intake manifold. In other words, it is more forgiving about keeping a good seal. I also think that it is a rip-off at $45, since it's basically made of grocery bags.