I am having a very difficult time finding a gasket for my D16Y8. On the mani, there are four small vacc. ports, that the gasket should go up and around, but no parts stores, shops, or dealers have a gasket that goes that high as to seal those vacc. holes. I was told on one forum to JB weld the ports closed, but isn'tthe gasket there to equalize pressure? What should i do, or does anybody know where i can get the proper gasket?