Valve reseating

[David.H]

Wondering why the original poster is considering valve seat inserts? assuming that's what he means.

If the problem is just that the valve seats are sunk into the block, a light skim will narrow the seats quite markedly without the risk of the pistons coming out the top of the block if the block is as it left the factory.  A skim should be a lot cheaper than the installation of a set of hard inserts.

The seats form  the hypotenuse of a virtual triangle, so every 10 thou' off the block  face will be just over 14 thou' off the seat width with any 45° valve setup- Certainly can't see that hard seat inserts would be necessary in any low revving motor with relatively light valve seat pressure.

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! Damage or other degradation will need re grinding or cutting of course.