Posted by MSM on March 13, 2020 at 09:54:30 from (172.58.190.130):
In Reply to: Valve job posted by Gary Mitchell on March 13, 2020 at 08:27:19:
50 years ago you would grind the seats. Now the seats are cut or replaced depending on how many times the seats have been ground or how far the seats are hammered down, or are old style soft seats which will wear quickly since the onset of unleaded gas not having any lubrication for the valves and seats. Now there is a spec for valve standout, especially on diesels. If the valves are too low compression is affected and the engine will be hard starting even when hot.last 4 cylinder gas head i had done was right at 500.it was resurfaced, seats and guides replaced, a couple of valves replaced. Last 4 cylinder diesel head I had done was 750. All new valves and seats, valve guides, flat surfaced, guides machined for umbrella seals, assembled and pressure tested.
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