That flathead is probably the closest thing anyone here has to a /6 like is the subject of the question.
Just remember my solid tappet are of the mushroom variety. No idea if that wold make a difference though. I just run off the shelf 10w30 on the original engine, which I have no idea how many miles are on it. The 230 I am building to swap in will run the same. Remember the stock valve spring pressures for my engine are 107-115 open and 40-45 closed. Pretty wimpy. Cam has .375" lift, intake duration at .050 is 208, exhaust duration at .050 is 210, advertised is 250/272 pretty wimpy.
