Were the lifter bores bushed? Is it possible that the oil goove/hole in lifter is coming above lifter bore when cam is at max lift. Have heard of that happening before. Just a thought
That is a good thought and I did have that problem with the first retrofit roller cam I bought. I had a custom lower base circle cam ground. During assembly I pressurized the oil system and spun the cam with lifters in place to make sure no bleeding off was occurring. So I am 100% sure I don't have that problem.