Valve reseating

[Stuart Giles]

Worth remembering that valve seat recession is unlikely to be much of a problem when using modern non leaded fuel.....no lead in the fuel back in the day! ...

But don't forget, once upon a time regrinding the valves was a regular maintenance routine; my father reckoned on doing it twice a year when he was doing around 10,000 miles per year!

And that, rather than exhaust valve seat recession is why you find so many valves, including inlets, sunk in to the cylinder head; or of course, the block on side valve motors. You can see that the valve seats on this motor are a reasonable width but only after I had machined about 20 thou off the block face. Even then you can still see some evidence (bottom middle to  left) of the damage caused by the gorilla who used a big cold chisel to separate the head from the block at some time in the past.