Exhaust valve seats

[Maggie13]

My exhaust ports still have some pitting after lapping so I was wondering if they need repairing should I get hardened seats for unleaded petrol or for a car not used too often is it really needed?

Any idea of how much it costs in total?

[RobPearce]

If you're having head work done anyway then it's worth getting the inserts - they don't add much cost and the newly-machined head would otherwise lack the "lead memory" that makes unleaded conversions usually unnecessary. Sorry, I don't remember what my Toledo's head rebuild cost.

[glang]

And, if you ever come to sell the car, for some buyers proof of valve seat replacement is quite desirable...

[Clive]

For prices you need to contact local machine shops, it seems location dependant to a certain degree. And get a 3 angle seat cut too if you go down that route.

[glang]

Out of interest Clive, I know the 3 angle cut is good for gas flow but is the downside that the risk of losing valve seat seal (ie pitting, burning, wear etc) is greater?