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- FREE GROUND SHIPPING -The Hellmann Performance Cummins Billet Valve Cover System solves issues stemming from high boost applications and a very restrictive crankcase breather system. Joe Hellmann has designed and manufactured a quality sealed system with an efficient and contained oil recycling path. This billet valve cover is a custom made product that cleans up the clutter of your engine bay and provides a high performance focal point on your Cummins diesel. The Hellmann 5.9L and 6.7L Cummins Common Rail Valve cover is a Custom made product.