Quote:
Originally Posted by barkster1971
It's nothing to do with octane rating or compression or pinking. I know it runs fine with unleaded. I am very slightly concerned with the valve seats that are now uncushioned by lead free petrol.
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Alloy headed engines have hardened seats to start with , the old wives tale about valve recession applies to old cast iron heads .. and even then it takes a long long time for anything to become evident .