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Katech also modified this pair of C5-R valve covers. The C5-R covers are ideal because of the extra rocker arm clearance they provide. Katech milled the C5-R logo away before CNC-machining both the Agostino Racing Engines' and Katech logos. Rather than use a messy conventional valve cover breather, ARE used this AN- fitting and braided hose that lead to an oil evacuation can situated in the battery's former location. Because ARE's valve covers of choice have no gasket provisions, other arrangements were necessary. Katech Engine Development machined an O-ring groove for valve cover sealing. Though it looks downright fragile, it seals perfectly. The C5-R valve covers do not duplicate the factory coil pack mounting design. With the coils relocated to where the A/C accumulator would normally live, valve cover access is greatly improved for hassle-free valve adjustments. The LS1's appearance is certainly cleaner once the cluttered coil pack wiring is moved, and the engine looks pretty darned good in its racy form.