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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.
that would accomplish very little besides lightening your wallet(unless of course the valve seats are very receded)Canadian Charlie said:I'd replace all 16 if it was my engine