Description: Brand New Supertech Performance STD Size Single Groove Valves, Dual Valve Springs, Titanium Retainer Set Fits: 2006-2011 Honda Civic Si - K20Z3 EnginesSupertech Valves: Includes: Complete Set of 16 Valves (8 Intake and 8 Exhaust Valves) Supertech Part # HIVN-1020 - Intake - STD Size - Dished Face Intake Valve Specs - 35.0mm Head Diameter - 5.48mm Stem Diameter - 108.85mm Length Supertech Part # HEVN-1020 - Exhaust - STD Size - Dished Face Exhaust Valve Specs - 30.0mm Head Diameter - 5.45mm Stem Diameter - 108.65mm LengthSupertech Dual Valve Springs: Includes: Complete Set of 16 Dual Valve Springs, Titanium Retainers, and Seats SPRK-H1019DOuter Spring - 30.0mm OD - 21.80mm ID Inner Spring - 21.30mm OD - 15.60mm ID 97 lb seat pressure @ 40.40mm 17.70mm Max Net Lift 22.70mm Coil Bind 14.80 lbs/mm Rate Black Nitride Valves- The micro hardness is higher than the stainless steel base material, keeping good ductility beneath the hard nitride layer (micro hardness is 800hv minimum) - Surface finish is smoother than with chromed valve stems, having less friction between the stem and guide. - Valve seat surface is harder with the nitride layer, lasting longer with lead free fuels, alcohols, nitro or other "explosive" mixes. Matches any kind of seats (nodular iron seats, steel powder metal seats, hard aluminum-copper seats or beryllium copper seats). - 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. Valve Springs and Titanium RetainersSupertech Performance Dual Valve Springs are made with premium Super Clean Chrome Silicon Vanadium Steel alloy for higher performance and durability at high rpms and better memory. Computer designed to ensure that wire stress levels do not overpass the limits of stress defined in the diagrams of fatigue for long durability under extreme conditions. Computer software also allows us to make sure that the harmonics are well under control. Titanium Retainers are manufactured with high quality military certified Titanium alloy, CNC machined for tight that will ensure long term durability. Supertech Performance is best known for high performance valves, and valvetrain components. With over 30 years of experience Supertech performance has been providing the racing market with first class parts for every type of racing application. Whether it is Drag Racing, IRL, Rally, Road Racing or any other motorsport for that matter, Supertech Performance has the perfect performance solution for your application. Please ask any questions you may have. We are always here to help and respond to inquiries in a quick, timely manner. Be sure to check out our other great items, we do combine shipping costs. (One shipping cost based on total package weight) Shipping Policy: We strive to ship your order in a prompt manner to meet the criteria for shipping time that we specify in the Item information. We offer a variety of shipping options based on what product you are purchasing and your desired time frame for delivery to meet the needs of all of our customers. Shipping charges are non-refundable. We will gladly combine shipping charges to one charged based on the total weight of the package. We proudly ship packages worldwide !!! Return Policy: We always look to satisfy our customers in whatever needs they may have. Returns are accepted within 14 business days of receiving the product. A 15% restocking fee may apply to your return, please contact us for details. Items must be in New condition with Original Packaging intact to be returned. Shipping charges are non-refundable. 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. We have the experience and know how to guide you in the right direction for your parts purchases as you build your high performance automobile. 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... ...but the product you receive will be specifically for your application as listed in the description * *Florida residents please add sales tax.*
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