Im battling oil mixing with my fuel right now in my stroke, i done the injector o rings and i guess i tore one or two o rings because its still using ALOT of oil, so im going to do it over again,
If you replace the valve covers rock auto has a good deal on the doorman it comes with the uvch and the external pigtails, and its much cheaper than ford, alot of people say use ford only but i have never had a problem with the doorman,
If you ever need injector o rings buy them from diesel o rings.com
and the 7.3 psd is a very simple and easy to work on engine that will last forever, mine has 292K on it