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When I peer into the valve cover while at TDC, I see that the front-most cam is about to contact the valve. The second cam back is at about 90° from the front one and on the way down also. So, I don't know where the cams should actually be oriented while at TDC. But I can say that the way mine looks at TDC is the same as shown in this picture...
http://www.ipdusa.com/uploads/images_products_slideshow/fullsize_7761.jpg
...cam lobes oriented about the same. In other words, if you put the cam in this picture directly into my car at exactly the same rotational position it would be at TDC.
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