Massive Trophy GM LS Valley Cover Plate Solid Knock Sensor Eliminate (Signature Purple) Lightweight - 2 lbs less than OEM cover and sensors/wiring Anodized!!! Impervious to the elements unlike competitors raw units which will corrode instantly Includes 12 point large flange grade 10.9 polished chrome ARP style fasteners! MADE IN USA! .250" 6061 billet aluminum - thick enough to be tapped for breather or vacuum pump