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Discussion Starter #1
I have a pair of chevy heads 427 1968, someone told me i needed to change the Valve Seats to prevent from damage due to the unleaded fuel in now days. Do I have to change all 16 of them or just the exhaust ones. Thank you.
 

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Weather or not hardened seats are necessary is some what controversial, do a search for previous threads on it has been discussed at some length
 
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