Having a freshly built 440 i am having an issue with clatter with my CompCam hydraulic roller lifters. The lifters bleed off quickly and I wondered if anyone else has had problems with their lifters and how they resoved it? I have a high pressure oil pump. The solid pushrods were also bought from CompCams. We have checked everything possible, including another oil pump, and the clatter still occurs. CompCams said the lifters oil through the lifter band but not sure how that would happen as there are no oiling holes. Educate me please.