GM guy, That smells like Chevy to me! 
I had hardened seats put in the G/P's heads due to the fact I had enough miles on the engine that it pulled two exhaust vales thru the head itself. Installed larger exhaust valves at that time also.
Mike
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so many pontiacs, so little time..................
moderator is a glorified word for an unappreciated prick..................
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the
former." --Albert Einstein
"There is no such thing as a good tax."
"We contend that for a nation to tax itself into prosperity is like a man standing in a bucket and trying to lift himself up by the handle."
- Winston Churchill
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