Thanks for the suggestions. I have already run the engine for break-in. I ran it at 1500 RPM for about an hour. The
oil pressure was very good (about 45-50 psi) for the whole time. Still they did not pump up. Perhaps the pushrods were too far into the lifters at the onset. I had set them to zero lash plus a half turn before running the engine at all. Do you suggest resetting them to just about zero lash and then run a while to fill the lifters and then reset them to zero lash plus a half turn?