I "touch up" ALL my new valves (in my grinder). OEM replacement valves vary WIDELY in quality. If they are out much "lapping" won't really help. I "lap in" all my valves but it's mostly to double check my seat location rather than improve seal. But HEY,,,, that's just ME! Bruce Hevner -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://list.amc-list.com/pipermail/amc-list-amc-list.com/attachments/20130416/c0059c99/attachment.htm> _______________________________________________ AMC-list mailing list AMC-list@xxxxxxxxxxxxxxxxx http://list.amc-list.com/listinfo.cgi/amc-list-amc-list.com