Re: 1951 valve guide replacement

Posted by Owen_Dyneto On 2014/10/19 9:01:29

I'm glad you got it out easily, sometimes they can really try your patience.

With a new guide and possibly a slightly different centerline for the valve, assuming the seat and valve face are in good shape I strongly suggest you hand-lap the valve face/seat lightly with some valve-grinding compound. A good technique to make sure you have full contact is, after lapping, use a soft pencil and make a series of radial lines across the valve face. Then rotate the valve under slight thumb pressure (without the spring installed) for a partial turn back and forth and make sure all the pencil lines have been broken by the seat. If the seat or valve face is questionable, have them refaced before reinstallation and that's a good time to ask yourself if, as long as you're into it this far, if it isn't time to examine and possibly reface/lap all the valves.