[James]

Originally Posted by Prowbar

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Yes, the camshaft lobes are ground on a slight taper, but the lifters should have a crown. Should they be flat, that would result in a line contact, which would wear rapidly. The crown helps break in and mating to the cam lobe. It does reduce spinning to an extent but helps distribute the load better due to increased surface area.

Take a look, this article explains it very well:

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Thanks. That was a good read. I always though the lifter was flat on the bottom. Having the slight crown explains a few things.