In regards to the notches on the rocker arms. If it looks like there is significant wear, is there a direct replacement, or is it like piston rings where it is dependent to your individual engine?
I would say it varies somewhat depending on engine mileage, previous maintenance, etc.
In my case, mine had 97K on them. I got the complete maintenance history when I bought the car and it was very good for most of its life. Then it seems the car got passed down in the family to someone who took it to college based on windshield stickers. The excellent maintenance seemed to stop about then and it was probably neglected for awhile. It was taken off the road about 1981 until I bought it.
At the last minute I brought the rockers to my machinist when I picked up the rebuilt head and he checked them with a fingernail and there were shallow grooves but not too bad at all. He said he could reface them and because i liked the guy so much I said do it. Unfortunately he died a couple weeks later. RIP. He started machining engines in 1962 and knew what he was doing.
