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How do you know if you have D heads?


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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

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On the top of the cylinder heads is a D stamped on both sets of heads? but the casting numbers start with a B? any ideas<P>Tks Kerry

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D ports were never put on any production car. There were only 47 (23 pairs and a spare) made, and the ports were so big that no stock intake or exhaust would fit them. My Brother had a pair (these photos are ont them) and they really didn't prove to flow any better than properly ported stock heads, but they were cool to have around. I believe the silver heads in these photos were factory aluminum.<P><img src="http://members.aol.com/buickfam/dportintake.jpg" width=800><P><img src="http://members.aol.com/buickfam/dportexhaust.jpg" width=800>

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