My 1966 Valiant Effort

Yeah, break in is done. At the recommendation of the engine shop, I used BR-40 break in oil. He said run it for about 20min....which is the time Comp suggests as well, then drain it.
I ran it in the car for about 3 days for good measure though, lol.
I've watched him do it many times on his dyno with all his race engines...not to mention he used dyno and tune JEG'S motors many years ago..late 90's-early 2000's.....so I trust him :)