Finish your Duramax engine build or PCV reroute off with this billet PCV Valve Cover Kit from DHD. Our billet covers are designed to replace those rusty stamped covers and phillips screws. Each cover is milled to accept the OE diaphragm and utilizes new stainless M5 Hardware. The bolt pattern on this cover is 1.325" x 1.325". If your cover bolt pattern measures 1.5" x 1.5" you'll need DHD 007-6010.