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I don’t believe Maney barrels have a reputation for wearing out the tappet bores. I think that provided things stay clean, they should be fine. It’s a large, low stressed and well lubricated surface area.


The problems arise if crap gets in there. My iron barrels tappet bores were shot, very heavily scored. It looked fairly obvious to me that a PO had got carbon or gasket detritus down there which had gradually turned itself into a horrid abrasive paste!


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