Guest Posted July 17, 2001 Share Posted July 17, 2001 I have heard of the elusive D heads for the 401/425 nailheads. I once heard that they were experimental aluminum heads and I have seen some pictures on a website. I am wondering if they are stamped with a D somewhere or if it is just the shape of the intake and exhaust ports.<P>Tks in advance, Kerry Link to comment Share on other sites More sharing options...
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