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Wtf! New valve guides knurled ? Or am i dumb

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Old 05-30-2020, 10:25 PM
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Default Wtf! New valve guides knurled ? Or am i dumb
Dropped my Bp4w head off with a machine shop who only does cylinder heads. Valve job, resurface and new guides. I can tell the guides were replaced. But why the F&*k did they knurl them? Do some shops do this to new guides for oil retention?

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Old 06-01-2020, 10:53 AM
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Yes, pretty normal oil retention grooves.
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Old 06-01-2020, 11:07 AM
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Originally Posted by themonkeyman
Yes, pretty normal oil retention grooves.
any idea if this reduces the life of the guide much ? Goal is to get 50k miles out of the forged motor im building before needing a rebuild
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