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Austinsevenfriends
Three angle valve seat - Printable Version

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RE: Three angle valve seat - mk1-mark - 04-11-2020

Those cheap valve cutting sets are total rubbish. You are more likely to irreparably damage a valve seat with one of them than improve it. As has been said, this sort of work is best done by a professional using a centreless valve seat cutting machine.

As far as reliability & performance are concerned, 3 angle seats are always worth doing, but as with all things, if they are worth doing, they are worth doing properly!