Hello,

602 valve job in question...
Are the valves & seats hardened with any method that requires a specialized
machining process beyond the normal scope of a standard well equipped machine shop.
In other words will the sealing surfaces be compromised in strength by being machined

( the reason I ask is SAAB uses a stellite hardening process on the exhaust valves which once cut through turns the valve to junk )

thanks

Nothing all that special on those engines regarding the valves. Certainly the seats are hardened as all are for quite a time now.

For some reason the last cylinders valve seats have been known to regress into the head further than the others with high milage. Just a straightforward repair though if needed. I am only responding because someone more knowlegeable has not yet.

Thank you very much for your response

regards