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Valve lapping
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3rd generation View Drop Down
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Joined: 09 Oct 2025
Location: Iowa
Points: 7 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 3rd generation Quote  Post ReplyReply Direct Link To This Post Topic: Valve lapping
    Posted: 6 hours 10 minutes ago at 8:25pm
I’m sure this has been long discussed if lapping is needed. I just had hardened seats installed and valves ground. Personally I trust modern machining for a good seal. How many of you still lapped valves with hardened seats?
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steve(ill) View Drop Down
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Joined: 11 Sep 2009
Location: illinois
Points: 88797 		Post Options Post Options   Thanks (0) Thanks(0)   Quote steve(ill) Quote  Post ReplyReply Direct Link To This Post Posted: 5 hours 11 minutes ago at 9:24pm
always a good idea to get a finish lap.. if nothing else, to CONFIRM it is correct..
Like them all, but love the "B"s.
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SteveM C/IL View Drop Down
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Joined: 12 Sep 2009
Location: Shelbyville IL
Points: 8693 		Post Options Post Options   Thanks (0) Thanks(0)   Quote SteveM C/IL Quote  Post ReplyReply Direct Link To This Post Posted: 4 hours 13 minutes ago at 10:22pm
Can't hurt? When seats and valves are ground/cut correctly it's not needed.
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DrAllis View Drop Down
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Joined: 12 Sep 2009
Points: 22210 		Post Options Post Options   Thanks (0) Thanks(0)   Quote DrAllis Quote  Post ReplyReply Direct Link To This Post Posted: 2 hours 60 minutes ago at 11:35pm
HELL  NO !!     Ask yourself this: do you think GM or FORD for example take the time to "lap" valves and seats after their modern and expensive valve grinding equipment has just mass produced hundreds of cylinder heads a day ?????? NOPE.
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