Re: Yblock valves
Ted Eaton (eatonbalancing.com) routinely installs hardened exhaust-valve seats when rebuilding engines. He doesn't take shortcuts because he backs his work. If your car is seldom driven, hardened seat are not necessary, as long as your existing seats are in good condition. However, I will have hardened seats installed when my engine is rebuilt. I want it done right the last time.
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