273 Rockers on a 1971 340

But at 30-50 psi at the gauge, there will be nothing like 30-50 psi in the shafts.... Maybe 5 psi...10 psi.... Really a lot lower. That's the way it was designed to be with the 'oiling interruptor' setup in the cam path. The whole rocker oiling setup is a bunch of leaks made to just get dribbles of
oil where needed LOL .... which is why it starts to fall apart with high RPM use.

What I wanted the OP to know is, if he put in banana grooves and got one a bit wide, then don't freak out. He says he is not pushing this engine hard.