It depends what you are using the car for. You can actually run a "leaded" head on unleaded providing you drive properly. To convert it to unleaded i don't think you need to do much more than either change valves or valve seats. If i bought a leaded engine, i would have it converted to unleaded while it was out of the car. Fords after 1989 are factory unleaded.
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Last edited by martinl : 4th July 2012 at 12:01 PM.
Reason: More info
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