FWIW-
I attempted to set the lash on my hydraulic roller lifters after I preoiled the motor (new build) and had trouble with some lifters not bleeding down. I'm not sure what caused this...maybe some assembly lube that I put on the ends of the pushrods got into the lifters and gummed up the works...I don't know...but I had to pull my intake. Not fun. Needless to say, I set my lash prior to preoiling and avoided assembly lube on the pushrods (just motor
oil).
phil