I just got done changing heads on my dads 350. It had some 441's and all of the exhaust valves were just kicking the crap out of there seats. Some of them literally sunk an 1/8" into the head! All this within maybe 5,000 miles. So do all old heads have to have hardened seats installed? Is it just the exhaust?

Just the exhaust. I've seen heads with sunken exhaust valves. Most people don't believe it but it happens.

Originally posted by Pat Kelley:
Just the exhaust. I've seen heads with sunken exhaust valves. Most people don't believe it but it happens. Very true.

I had two exhaust gaskets brech they sunk in so much. I had larger valves added into the head, but cheaped out on the seats per someone elses advice. Cause my motor to hydrolock and break a lot of graemlins/angry.gif

nice pics BB mike. Do you mind my asking what type of seats those are and how much they cost? They look really good. graemlins/thumbsup.gif

Dear GOD 19NOVA72.....you should get a beater car and not drive that nice nova in that kind of weather. Poor car. lol seriously man