Rick,
I am sure the hydraulic lifters require more
oil and that you plug the galleys if changing to a solid cam. I also THINK, not sure that a roller cam has steeper ramps than a flat tappet type. I am not sure if Brent has roller lifters or not, but I had wondered if the cam was the wrong one. However as many times as he has had this problem I figured they had checked on this.
Ron