Originally Posted by 001mustang
My 351W SBF World Product Heads have square exhaust ports. My Hedman 88650 headers have oval ports that are too long and overextend the square head exhaust port flange area about 1/16". Since the header oval port is too big the header gaskets fail in short order (make a ticking sound). I am wondering if I can fabricate a header adapter gasket from 1/8" - 1/4" metal plate to properly mate the square head exhaust ports to the oval header ports?
Instead of fabricating an adapter plate, I would fabricate a flange and cut the header tubes off the old flange and weld them onto the new one. If you fabricate an adapter, you will have to use 2 gaskets instead of 1.