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Jul 21st, 2025 | | | | Joined: Mar 2009 Posts: 100 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2009 Posts: 100 | after removing my valves i have found 3 of them that have some deep pitting on the top of the vale. It wont affect the way they sit but just curious if it would affect how good the engine runs.
It's better to have it and not need it, then it is to need it and not have it. "Woodrow F. Call"
| | | | | Joined: Jan 2008 Posts: 4,903 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,903 | Are you talking about the tip of the stem or on the face of the valve? | | | | | Joined: Mar 2009 Posts: 100 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2009 Posts: 100 |
It's better to have it and not need it, then it is to need it and not have it. "Woodrow F. Call"
| | | | | Joined: Mar 2009 Posts: 100 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2009 Posts: 100 | how worn should the valve seats be on the valve. i have lapped mine with compound and they still have some pitting but i dont know how bad it is.
It's better to have it and not need it, then it is to need it and not have it. "Woodrow F. Call"
| | | | | Joined: Jan 2008 Posts: 4,903 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,903 | Valve seats must be almost perfect. If the seats are pitted, you need them worked at a machine shop. I still use 50+ year old valve grinding equipment which works fine but you probably find a mechanic that still has this equipment for knows how to use it. | | | | | Joined: Mar 2009 Posts: 100 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2009 Posts: 100 | new valves are only 70 for both intake and ex, is that cheaper than machining
It's better to have it and not need it, then it is to need it and not have it. "Woodrow F. Call"
| | | | | Joined: Sep 2001 Posts: 29,262 Bubba - Curmudgeon | | Bubba - Curmudgeon Joined: Sep 2001 Posts: 29,262 |
Where I live, $70 for 12 valves (with proper cut on the mating-face) would be cheaper than machining 12 old valves.
| | | | | Joined: Jan 2008 Posts: 4,903 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,903 | New valves are cheaper than refacing the old ones. However if his valve seats are pitted, it is quite likely that the seats need working as well as the guides. Once the seats get too wide, there is no correcting them with lapping. They must either be ground with 3 different stones like I use, or cut with modern equipment. If guides are worn, they must either be replaced, knurled or sleeved. | | | | | Joined: Mar 2009 Posts: 100 Wrench Fetcher | | Wrench Fetcher Joined: Mar 2009 Posts: 100 | thanks the pictures help, i will post some pics of the valves maybee you guys can tell
It's better to have it and not need it, then it is to need it and not have it. "Woodrow F. Call"
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