{"product_id":"head-racing-gx390-large-port-high-rpm-honda-core","title":"Head, Racing, GX390, Large Port, High RPM, Honda Core","description":"\u003cstyle\u003e\n.footer-links { text-align: left; padding: 20px; margin: 30px 0; font-size: clamp(12px, 2.5vw, 16px); } .footer-links a { color: #000; text-decoration: none; font-weight: 700; margin: 0 10px; border-bottom: 2px solid #ffcc00; transition: all 0.3s; display: inline-block; } .footer-links a:hover { color: #ffcc00; }\n\u003c\/style\u003e\n\u003cdiv class=\"nonselectable\"\u003e\n\u003cdiv class=\"footer-links\"\u003e\n\u003ca href=\"https:\/\/gokartsusa.biz\/pages\/parts-for-powersports\"\u003e\u003c\/a\u003e\u003ca title=\"Cylinder Heads\" href=\"https:\/\/gokartsusa.biz\/collections\/cylinder-head-kart-racing\"\u003eHead\u003c\/a\u003e | \u003ca title=\"Guide\" href=\"https:\/\/gokartsusa.biz\/pages\/head-selection-guide\"\u003eGuide\u003c\/a\u003e | \u003ca title=\"Racing Engine Parts\" href=\"https:\/\/gokartsusa.biz\/collections\/go-kart-speed-parts\"\u003eHotrod\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cb\u003eLarge Port Ready-to-Go Race Head for GX390 \u003c\/b\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cb\u003ewith Genuine Honda Core\u003c\/b\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cbr\u003e\u003cspan\u003eThis head uses a Genuine Honda core for better flow, less porosity, and higher strength than aftermarket heads. Head may be fitted with either single or dual springs. Single springs are recommended for 306 and smaller cams; duals are recommended for 307 and larger.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003eGX390 heads have the options of 36mm, 38mm, or 40mm intakes.\u003c\/b\u003e\u003cbr\u003e\u003cspan\u003e*GX390 heads will fit GX340s.\u003c\/span\u003e\u003cbr\u003e\u003cb\u003e\u003cbr\u003eWe offer heads in two port sizes:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003e\"\u003ca href=\"https:\/\/gokartsusa.biz\/collections\/cylinder-head-kart-racing\/products\/bare-genuine-honda-cylinder-head-for-gx390-ut2-small-port\"\u003eSmall Port, Torquer\u003c\/a\u003e\"\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003euses small port castings to increase velocity and maximize low-end power at some loss of high-end RPM. These are the best choice for most applications.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e\"\u003ca href=\"https:\/\/gokartsusa.biz\/collections\/cylinder-head-kart-racing\/products\/head-racing-gx390-large-port-high-rpm-honda-core\"\u003eLarge Port, High RPM\u003c\/a\u003e\"\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003euses large port castings to increase high-end RPM power at some loss of low-end torque and reduced throttle response. They may provide increased cooling for endurance applications.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003eProduct Includes:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePorted, and bead blasted head, milled to specs\u003c\/li\u003e\n\u003cli\u003eStainless intake and exhaust valves\u003c\/li\u003e\n\u003cli\u003eAluminum or titanium retainers\u003c\/li\u003e\n\u003cli\u003eSplit keepers\u003c\/li\u003e\n\u003cli\u003eHD single or dual springs\u003c\/li\u003e\n\u003cli\u003eValve spring shims\u003c\/li\u003e\n\u003cli\u003e3-Angle valve job\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIncreased milling increases compression, but may affect reliability.  .120 not recommended\u003c\/p\u003e\n\u003cp\u003e\u003cb\u003e*Note:\u003c\/b\u003e\u003cspan\u003e Heads are typically built to order. Please allow approximately 1-5 days before shipping.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"GoKarts USA®","offers":[{"title":"36 Intake 32 Single Alum Retainers \/ Do Not Mill","offer_id":43060128383035,"sku":"NR-HEAD-RACING-GX390-LARGE","price":293.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head .025\"","offer_id":43060128415803,"sku":"NR-HEAD-RACING-GX390-LARGE","price":293.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head .050\"","offer_id":43060128448571,"sku":"NR-HEAD-RACING-GX390-LARGE","price":293.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head .065\"","offer_id":43060128481339,"sku":"NR-HEAD-RACING-GX390-LARGE","price":293.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head 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