Roush Yates Engines has unveiled new, two-piece valve covers for the Yates D3 cylinder heads. Designed with a lower profile and produced from billet aluminum, these new assemblies, comprising a base and a cover, have several interesting advantages.
 
First the two-piece design allows valve adjustments to be made without oil spill, as the covers can be removed while the bases remain attached to the heads. A flat gasket is used to seal the base to the cylinder head; a 0.135-inch O-ring is used to seal the valve cover to its base. Eight studs, which are common to both valve cover and base, are used to attach both items to the cylinder head. Each stud is equipped with double nuts.
   
Because valve springs can become perilously hot, these valve cover bases are equipped with tiny ports from which pressurized oil is sprayed onto the valve springs and valve train to aid cooling. The tiny ports are linked to a long, gun-drilled oil galley terminating in NPT threaded ends, which accept AN fittings. A 37-degree AN-4 flared fitting is installed in the front port; an AN-4 plug in the rear.
   
To monitor engine vacuum conveniently, threaded ports are offered as an option. These can be added to each end of the valve covers, allowing the driver to monitor engine condition from the cockpit.
   
Both base and cover are available in several anodized colors: black, gold, red, blue, or clear. And last but not least, these valve covers are available with the Roush Yates logo or in a plain finish without a logo or with a laser-engraved logo of your choice.  The kits are complete and available for $600 per set.

For more information email dmoore@roushyates.com or visit www.roushyatesparts.com