Quote:
Originally Posted by OrrieG
Am I missing something here. Wouldn't it be easier to champher the part that slips over the valve guide? Why can't they just manufacture a shim with the right inside diameter and configuration?
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Nope, not missing anything. They should fit in theory and design without grinding, but trying to fit something in between the spring and the seat / guide is tough to do as there isn't much room and sometimes casting irregularities can cause it not to fit.