{"product_id":"high-performance-ecotec-intake-valves-for-2-0l-2-2l-2-4l-engines","title":"BK Racing Ecotec Performance Intake Valves for 2.0L, 2.2L \u0026 2.4L Engines","description":"\u003ch2\u003eHigh-Performance Ecotec Intake Valves for 2.0L, 2.2L \u0026amp; 2.4L Engines\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eBK Racing HF35.6 Ecotec Performance Intake Valves\u003c\/strong\u003e were developed specifically for high-performance and racing GM Ecotec engines. Manufactured from \u003cstrong\u003e21-4N stainless steel\u003c\/strong\u003e, fully nitrided after final machining, flow-bench tested, and engineered with an airflow-optimized profile, these are not simply replacement Ecotec intake valves.\u003c\/p\u003e\n\u003cp\u003eOur goal was to develop a performance intake valve around \u003cstrong\u003eairflow, curtain area and valve geometry\u003c\/strong\u003e rather than simply making the valve as large as possible.\u003c\/p\u003e\n\u003cp\u003eThat approach produced measurable results.\u003c\/p\u003e\n\u003cp\u003eDuring development with \u003cstrong\u003eMWR Technologies\u003c\/strong\u003e, our prototype BK Racing Ecotec intake valve showed an improvement of approximately \u003cstrong\u003e10 CFM over the OEM GM Ecotec intake valve at .050\" lift\u003c\/strong\u003e on the same cylinder head and flow bench.\u003c\/p\u003e\n\u003cp\u003eThe result was the \u003cstrong\u003eBK Racing HF35.6\u003c\/strong\u003e — a 35.6 mm performance Ecotec intake valve developed specifically around the airflow characteristics of the Ecotec cylinder head.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy We Developed Our Own Ecotec Intake Valve\u003c\/h2\u003e\n\u003cp\u003eThere are already stainless, nitrided and oversized intake valves available for the GM Ecotec.\u003c\/p\u003e\n\u003cp\u003eWe weren't interested in simply making another replacement valve.\u003c\/p\u003e\n\u003cp\u003eWe wanted to find out how much could be gained by looking at the \u003cstrong\u003eentire intake valve as part of the airflow path\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eDevelopment focused on the relationship between valve diameter, curtain area, backside profile, stem obstruction and the transition between the valve head and stem.\u003c\/p\u003e\n\u003cp\u003eThat distinction is important.\u003c\/p\u003e\n\u003cp\u003eA larger intake valve doesn't automatically mean a better-flowing intake valve.\u003c\/p\u003e\n\u003cp\u003eValve diameter is only one part of the relationship between the valve, seat, throat, combustion chamber and intake port. Increasing diameter can increase potential curtain area, but the valve still has to work efficiently with the rest of the Ecotec cylinder head.\u003c\/p\u003e\n\u003cp\u003eThat's why we developed the HF35.6 around a \u003cstrong\u003e35.6 mm (+0.5 mm) valve head\u003c\/strong\u003e rather than simply pursuing the largest valve we could fit.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eFlow-Tested Against the OEM GM Ecotec Intake Valve\u003c\/h2\u003e\n\u003cp\u003eWe don't want customers to have to rely solely on claims about what a valve \u003cem\u003eshould\u003c\/em\u003e do.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWe tested it.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDuring prototype development at MWR Technologies, the BK Racing intake valve demonstrated an improvement of approximately:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e+10 CFM over the OEM Ecotec intake valve at .050\" lift\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe largest improvement appeared in the low-lift region, where the relationship between the valve, seat and available curtain area has a significant influence on airflow.\u003c\/p\u003e\n\u003cp\u003eAs lift increased, the difference narrowed as other areas of the cylinder head increasingly became part of the airflow limitation.\u003c\/p\u003e\n\u003cp\u003eThat's exactly why we believe looking at the \u003cstrong\u003ecomplete flow curve\u003c\/strong\u003e matters more than simply advertising valve diameter.\u003c\/p\u003e\n\u003cp\u003eAdditional testing against OEM and leading aftermarket Ecotec intake valves is planned, and we will publish those results as testing is completed.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e35.6 mm (+0.5 mm) Ecotec Intake Valves\u003c\/h2\u003e\n\u003cp\u003eThe BK Racing HF35.6 uses a nominal:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e35.6 mm intake valve head\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis places it approximately \u003cstrong\u003e0.5 mm larger than the commonly published 35.1 mm OEM-size Ecotec intake valve\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eWe chose this size intentionally.\u003c\/p\u003e\n\u003cp\u003eRather than jumping directly to a substantially oversized valve, the HF35.6 combines the additional curtain area of a modest increase in diameter with an airflow-focused valve profile.\u003c\/p\u003e\n\u003cp\u003eThe philosophy behind the design is simple:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMake the entire valve work with the cylinder head.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eAirflow-Optimized Intake Valve Profile\u003c\/h2\u003e\n\u003cp\u003eAn intake valve becomes part of the airflow path every time it lifts away from the seat.\u003c\/p\u003e\n\u003cp\u003eThe shape of the backside, the transition into the stem, exposed stem area and valve-head geometry can all influence how efficiently air moves past the valve and into the cylinder.\u003c\/p\u003e\n\u003cp\u003eThe BK Racing HF35.6 incorporates an \u003cstrong\u003eundercut stem, airflow-optimized backside profile and flat chamber-side face\u003c\/strong\u003e developed specifically around the Ecotec cylinder head.\u003c\/p\u003e\n\u003cp\u003eRather than duplicating the OEM valve shape in a different material, the HF35.6 was developed as a performance valve from the beginning.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003e21-4N Stainless Steel Ecotec Intake Valves\u003c\/h2\u003e\n\u003cp\u003eBK Racing HF35.6 Ecotec intake valves are manufactured from \u003cstrong\u003e21-4N stainless steel\u003c\/strong\u003e for strength, wear resistance and durability in demanding performance and racing applications.\u003c\/p\u003e\n\u003cp\u003eOur priorities were:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStrength • fatigue resistance • wear resistance • dimensional stability • sustained-RPM durability\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBut selecting the material was only part of the process.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eFully Nitrided After Final Machining\u003c\/h2\u003e\n\u003cp\u003eNot all nitrided valves are manufactured the same way.\u003c\/p\u003e\n\u003cp\u003eBK Racing Ecotec intake valves are \u003cstrong\u003efinish-machined first and nitrided afterward\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eWe specified that manufacturing sequence intentionally.\u003c\/p\u003e\n\u003cp\u003eNitriding produces a hardened surface layer that can improve wear and surface resistance. Machining or grinding treated areas afterward can remove some of that treated surface.\u003c\/p\u003e\n\u003cp\u003eWe didn't want to manufacture them that way.\u003c\/p\u003e\n\u003cp\u003eThe required machining and final geometry are completed first. The finished valve then receives its nitriding treatment, allowing the treated surface to remain through important areas of the finished valve.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eFinish the valve first. Then nitride the finished component.\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eTwo Ecotec Intake Valve Configurations\u003c\/h2\u003e\n\u003cp\u003eUnlike our exhaust valve, the HF35.6 intake valve will be available in \u003cstrong\u003etwo configurations\u003c\/strong\u003e so builders can select the version appropriate for their camshaft.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eStandard \/ Stock Base Circle\u003c\/strong\u003e\u003cbr\u003eDesigned for stock camshafts and aftermarket camshafts retaining stock-style base-circle geometry.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eReduced Base Circle \/ Regrind\u003c\/strong\u003e\u003cbr\u003eDesigned for reduced-base-circle and reground camshaft combinations where additional valve-tip height can be used when establishing proper valvetrain geometry.\u003c\/p\u003e\n\u003cp\u003eThis gives engine builders the ability to select the correct valve for the camshaft combination rather than forcing one valve configuration to work in every application.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eDesigned as Part of a Complete BK Racing Ecotec Valvetrain\u003c\/h2\u003e\n\u003cp\u003eThe intake valve is only one component of the complete Ecotec valvetrain.\u003c\/p\u003e\n\u003cp\u003eAs RPM and camshaft demands increase, maintaining valve control becomes increasingly important.\u003c\/p\u003e\n\u003cp\u003eThe BK Racing HF35.6 Intake Valves can be combined with our \u003cstrong\u003e83 lb Ecotec Valve Springs, Lightweight Titanium Retainers and Solid Lash Adjusters\u003c\/strong\u003e to build a more complete performance Ecotec valvetrain.\u003c\/p\u003e\n\u003cp\u003eOur 83 lb springs provide approximately \u003cstrong\u003e83 lb of seat pressure at a 1.325\" installed height\u003c\/strong\u003e and approximately \u003cstrong\u003e230 lb at .500\" lift\u003c\/strong\u003e, and have been tested in Ecotec applications to approximately \u003cstrong\u003e9,300 RPM\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eFor combinations using BK Racing Solid Lash Adjusters, our typical starting lash specifications are:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eIntake: .008\"\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eExhaust: .010\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eFinal lash should always be established for the specific camshaft and engine combination.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eBK Racing HF35.6 Ecotec Intake Valve Specifications\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eProduct:\u003c\/strong\u003e BK Racing HF35.6 Performance Ecotec Intake Valves\u003cbr\u003e\u003cstrong\u003eApplication:\u003c\/strong\u003e GM Ecotec 2.0L \/ 2.2L \/ 2.4L\u003cbr\u003e\u003cstrong\u003eMaterial:\u003c\/strong\u003e 21-4N stainless steel\u003cbr\u003e\u003cstrong\u003eTreatment:\u003c\/strong\u003e Full nitriding after final machining\u003cbr\u003e\u003cstrong\u003eHead Diameter:\u003c\/strong\u003e 35.6 mm nominal (+0.5 mm)\u003cbr\u003e\u003cstrong\u003eValve Face:\u003c\/strong\u003e Flat\u003cbr\u003e\u003cstrong\u003eBackside:\u003c\/strong\u003e BK Racing airflow-optimized profile\u003cbr\u003e\u003cstrong\u003eStem Diameter:\u003c\/strong\u003e Approximately 5.97 mm\u003cbr\u003e\u003cstrong\u003eStem:\u003c\/strong\u003e Undercut airflow profile\u003cbr\u003e\u003cstrong\u003eKeeper:\u003c\/strong\u003e OEM-style triple groove\u003cbr\u003e\u003cstrong\u003eCamshaft Options:\u003c\/strong\u003e Standard \/ Stock Base Circle or Reduced Base Circle \/ Regrind\u003cbr\u003e\u003cstrong\u003eQuantity:\u003c\/strong\u003e Set of 8 intake valves\u003cbr\u003e\u003cstrong\u003eQuality Control:\u003c\/strong\u003e 100% inspected and supplied in matched production sets\u003cbr\u003e\u003cstrong\u003eDevelopment:\u003c\/strong\u003e BK Racing Products\u003cbr\u003e\u003cstrong\u003eFlow Testing:\u003c\/strong\u003e MWR Technologies\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eGM Ecotec Engine Applications\u003c\/h2\u003e\n\u003cp\u003eBK Racing HF35.6 performance intake valves were developed for compatible cylinder heads within the \u003cstrong\u003eGM Ecotec engine family\u003c\/strong\u003e, including popular \u003cstrong\u003e2.0L, 2.2L and 2.4L Ecotec performance applications\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThese engines can be found throughout Chevrolet, Pontiac and Saturn platforms including the \u003cstrong\u003eChevrolet Cobalt, Cavalier and HHR, Saturn Ion and Sky, and Pontiac Solstice\u003c\/strong\u003e, among other Ecotec-equipped vehicles.\u003c\/p\u003e\n\u003cp\u003eThey are particularly suited to:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCircle-track Ecotec engines • high-RPM naturally aspirated builds • performance cylinder heads • modified camshaft combinations • reground camshafts • competition engines • performance 2.2L Ecotec builds • performance 2.4L Ecotec builds\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSpecific engine and cylinder-head compatibility should always be verified before installation.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy Choose BK Racing Ecotec Intake Valves?\u003c\/h2\u003e\n\u003cp\u003eThe BK Racing HF35.6 brings together the features we wanted in a serious performance \u003cstrong\u003eEcotec intake valve\u003c\/strong\u003e:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e21-4N stainless-steel construction\u003c\/li\u003e\n\u003cli\u003eFull nitriding after final machining\u003c\/li\u003e\n\u003cli\u003e35.6 mm (+0.5 mm) valve head\u003c\/li\u003e\n\u003cli\u003eAirflow-optimized valve geometry\u003c\/li\u003e\n\u003cli\u003eUndercut stem\u003c\/li\u003e\n\u003cli\u003eFlat chamber-side face\u003c\/li\u003e\n\u003cli\u003eTwo camshaft\/base-circle configurations\u003c\/li\u003e\n\u003cli\u003e100% inspected matched sets of eight\u003c\/li\u003e\n\u003cli\u003eFlow-bench developed against the OEM Ecotec intake valve\u003c\/li\u003e\n\u003cli\u003eApproximately \u003cstrong\u003e+10 CFM demonstrated at .050\" lift during prototype testing\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDesigned to integrate with the complete BK Racing Ecotec valvetrain system\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWe didn't develop these because the Ecotec market needed another replacement intake valve.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWe developed them because we believed the Ecotec intake valve could be better.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eSold as one matched set of \u003cstrong\u003e8 BK Racing HF35.6 Performance Ecotec Intake Valves\u003c\/strong\u003e.\u003c\/p\u003e","brand":"BK Racing","offers":[{"title":"Extended Tip for Regrind Cams","offer_id":50549557198936,"sku":null,"price":269.99,"currency_code":"USD","in_stock":true},{"title":"Stock Tip Length (For Cams with larger base 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