Higher RPM engines take full advantage of all previous features. The higher the engine speed the bigger the power loss due to internal engine friction! The black nitride layer reduces this power loss due to less valve-guide friction. The nitride layer is adhered to the base material at microscopic level, so it will not "flake" or brake when the valves bend due to impacts with the pistons.
The Black Nitride applies to the whole valve while the chrome coating is only applied to the stem. All valves are swirl polished, have stem undercut, a hardened tip, and more.Please ask any questions you may have. We are always here to help and respond to inquiries in a quick, timely manner. IPGparts has been in business for 15 years servicing the Automotive Performance Industry. We are proud to bring you fair prices on the top parts available for the automotive performance industry. Working closely with many of the top business names in the industry and located in Orlando, FL we are a full product support facility with the ability to obtain any product that you have in mind. Our racing programs offer us the chance to test and use quality products on the market to further develop and ultimately allow us to give real world feedback on the hottest and most useful products. The parts you see offered for sale are the best of the best. We don't just sell parts to maintain the business, we sell the parts that will help you perform better and WIN!! Some images being used are just for representation purposes and may not reflect the actual product you receive.. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts & Accessories\Engines & Engine Parts\Valvetrain Components\Valves". The seller is "ipgparts" and is located in this country: US. This item can be shipped worldwide.