Does such a thing exist? I have a pair of aluminum heads I bought used, not noticing that the exhaust ports have been opened up nearly to W2 size. With the standard headers, this would have a good amount of exhaust gas flow crashing into the header flange. I think there is enough material to seal, but I would prefer to be able smooth out the transition from the exhaust runner into the header.

This will be for a driver/street stroker. So it has to be a fix that will last more than a race or a season