Hey Guys,

So my fresh rebuild has about 300 miles on it. Motor was broken in on the dyno, drained of its oil, I installed it, put fresh oil in it, ran it for about 200km and just put fresh oil in again. Being the total stress case I am, I am always checking for leaks after each drive and listening for odd noises. I thought after having a listen I could here a faint ticking noise, reved up the motor and sure enough there is a tick in the valve train. Is it common on a fresh rebuild that you have to re-adjust the valve lash after such a short period of time?
Car is a 1966 Thunderbird, 390Fe RV cam.
Running 10W30 Oil (ford Motorcraft Diesel) I was told to run this because of the additives.
Sorry if these are kinda newb questions, I am an apprentice and still learning, and Im trying to do my best to protect my latest investment in this engine rebuild.