Hardened valves

[Dotty traveller]

Hi everyone, I'm thinking of putting hardened valves in doris. How easy is it,do you have to change all 8.and do you have to lap them in.

[svenedin]

It’s not the valves it’s the valve seats. The exhaust valve seats specifically.

Stephen

[King Kenny]

Hi Stephen. Assuming you mean hardened valve seats. Once the head is returned to you It would be best to fit new valves. When fitting the Valves they have to be lapped in to produce an air tight seal. It is not difficult to do.

[Mick Lynch]

Ask the machine shop to cut the hardened seats to suit. You usually supply an exhaust valve to them if they aren’t supplying new valves so they can determine the angle. It costs next to nothing.