SomtingGuy: The Ford 4.6L DOHC engine uses a RFF valvetrain (Roller Finger Follower) and has no tappets per se. Pushrod style engines use tappet offset to ensure rotation of the tappets, but there is no need to do this with a RFF valvetrain, as the cam followers have a roller incorporated...
Who has direct experience (successful experience preferred) repairing stripped threads in a cast iron exhaust manifold? This is a very high-heat turbo application so please don't use the word Loctite anywhere near your recommendation. :-]
I want to hear specific experience with Keen-serts vs...