{"product_id":"gsc-p-d-toyota-supra-bmw-z4-b58-chrome-polished-exhaust-valve-28-5mm-head-set-of-12","title":"GSC P-D Toyota Supra\/BMW Z4 B58 Chrome Polished Exhaust Valve 28.5mm Head - Set of 12","description":"\u003cp\u003eOur goal in creating our valves was to produce the highest performance and longest lasting valves available for the aftermarket. To achieve this, we utilized advanced 3D design and simulation software to develop a stronger and better flowing valve head design. We conducted flow tests on prototype valve heads in specific applications to ensure that we offer the highest flowing valve head on the market. By using high-quality materials, we achieved less valve distortion at the face compared to other designs we tested. This reduced distortion allows for better sealing under extreme conditions and ensures more consistent performance throughout the valve's lifespan.\u003cbr\u003e\u003c\/p\u003e\n\u003ch5\u003e\u003cstrong\u003eApplications\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003eToyota\/BMW B58\/S58\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch5\u003e\u003cstrong\u003eFeatures\u003c\/strong\u003e\u003c\/h5\u003e\n\u003cul\u003e\n\u003cli\u003eSwirl polished heads for smoother air flow over the valve\u003c\/li\u003e\n\u003cli\u003eBack cut to reduce valve weight for higher RPM, higher boost pressure, and allow for more aggressive cam profiles without increasing valve spring seat pressures\u003c\/li\u003e\n\u003cli\u003eValve stems are micro polished to allow for less oil retention on the stem, which creates less drag on the stem to guide for a smoother motion\u003c\/li\u003e\n\u003cli\u003eIntake valves are a modified 21-4n stainless\u003c\/li\u003e\n\u003cli\u003eValve tips are either hardened or have a stelite wafer tip fused so that the tip is within 5 Rockwell C of the rocker or valve tappet for extended life and less wear\u003c\/li\u003e\n\u003cli\u003eValve tip lengths - we have taken extra time to adjust tip heights on the applications to require less tipping of the valve, to maintain proper tip height for proper valve train geometry, and to cut down on install times when setting valve lash\u003c\/li\u003e\n\u003cli\u003eWe have also adjusted the keeper groove to properly balance intake and exhaust spring pressures to reduce the use of valve spring shims and maximize performance from our spring and retainer kits\u003c\/li\u003e\n\u003cli\u003eValves will work with an OEM keeper\/lock or, when available, our upgraded keeper\/lock. It is not mandatory, but it is suggested, that any valve lock not be reused on performance applications due to material grooving\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c!----\u003e","brand":"GSC Power Division","offers":[{"title":"Default Title","offer_id":47203410084154,"sku":"gsc2092-12","price":453.76,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0025\/9709\/3420\/products\/424442eb2e2c83e1dc5e8dbc35ae1193_aff26c3e-2dfe-4231-aa4b-d5dbc6580820.png?v=1700085951","url":"https:\/\/www.kamispeed.com\/en-ca\/products\/gsc-p-d-toyota-supra-bmw-z4-b58-chrome-polished-exhaust-valve-28-5mm-head-set-of-12","provider":"KamiSpeed.com","version":"1.0","type":"link"}