This gasket would worry me, though perhaps it shouldn't. note the sealing surfaces. Two problems I see with this, one of which is -very- bad. At the lower point of the gasket, it would allow coolant to stagnate in the cavity at the bottom. The worse problem is the bypass port. Note how the gasket does not seal off the bypass, thereby pushing new coolant right back around to itself. This could lead to less recirculation through the radiator, not a good thing.