Found the page in Bruce's book that confuses me about the Dilavar studs(I knew dilivar didn't look right
). On page 114 it states that: "Unfortunately, Porsche's change to Dilavar head studs did not start until 1977, when Porsche changed the lower row of head studs to studs made of Dilavar material".
Dsentel, you are right about the valve guides. He says they were changed in 77 to the silicon bronze alloy. (same page as a matter of fact: 114)
My car runs like a top, passes emissions beautifully, and is a kick to drive, so I am just hoping for good news here.
Craig