> and the precision of the barrel of
> the lifter. Any loose fit or departure from perfect roundness of the bore or
> the lifter can prevent rotation.
Which might explain why many have a slight dome to them. A domed lifter
combined with a tapered cam would tend to compensate for any error in the angle
of the lifter bore. I've heard that "cam walk" is a common problem when
converting to roller lifters, so clearly production tolerances aren't
particularly tight in this area.
I dunno ... just know that Babe Erson, Crane Cams and someone at Isky have all
told me that non-roller lifters should be domed.
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