It's really early in the discovery process at this point, but my customer has had an issue with his cam/lifter situation.
It may end up being like the "chicken and the egg"..... As to which was the cause of the problem.......but I was pretty surprised to learn his lifters didn't have any way to pressure feed the bushings.
But they DO...the hole above the axle is hydraulically feed via the wall clearance between the body and the bore. If it makes the builder feel any more confident you could groove a channel on the bore connecting the two feed holes.
