273 intake runner size ? gaskets .

Ouch, I don't have any heads off to measure for you. The only gaskets I know are for the 318. The application will include 273 and the ports will be big. Not much you can do about that. Summit has quite a few different gaskets available. Don't use the port size chart on the left. There are only a few gaskets that have sizes listed. With a 273 you need to buy the smallest they have available. tmm