{"product_id":"ready-to-go-race-head-for-gx390-420cc-and-460cc","title":"Ready-to-Go Race Head for GX390, 420cc, and 460cc","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 href=\"https:\/\/gokartsusa.biz\/collections\/cylinder-head-kart-racing\" title=\"Cylinder Heads\"\u003eHead\u003c\/a\u003e | \u003ca href=\"https:\/\/gokartsusa.biz\/pages\/head-selection-guide\" title=\"Guide\"\u003eGuide\u003c\/a\u003e | \u003ca href=\"https:\/\/gokartsusa.biz\/collections\/go-kart-speed-parts\" title=\"Racing Engine Parts\"\u003eHotrod\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp\u003e\u003cspan\u003eUses aftermarket GX390 style large-port casting. Heads are ported, bead blasted, flowed, and milled. Heads can be fitted with either single or dual springs. Single springs are recommended for 306 and smaller cams; dual springs are recommended for 307 and larger cams. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eChoose a 36 or 40mm Intake Valve, comes with 32mm Exhaust Valve. \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIncreased milling can increase compression, but at the expense of reliability. ** \u003c\/span\u003e\u003cspan\u003e.120 Not Recommended.\u003cbr\u003e\u003cbr\u003e\u003cb\u003e\u003c\/b\u003e\u003c\/span\u003e\u003cspan\u003e\u003cb\u003eProduct Includes:\u003cbr\u003e\u003c\/b\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003ePorted \u003c\/span\u003e\u003cspan\u003e\u0026amp; Bead Blasted Head, Milled to Specs\u003cbr\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eOversize Stainless Intake \u0026amp; Exhaust Valves\u003cbr\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eAluminum or Titanium Retainers\u003cbr\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eSplit Keepers\u003cbr\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eHD Single or Dual Springs\u003cbr\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003eValve Spring Shims\u003cbr\u003e\u003c\/span\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cspan\u003e\u003c\/span\u003e\u003cspan\u003e3-Angle Valve Job \u003c\/span\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"GoKarts USA®","offers":[{"title":"36 Intake 32 Single Alum Retainers \/ Do Not Mill","offer_id":43060129988667,"sku":"NR-HEAD-RACING-390-CLONE","price":250.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head .025\"","offer_id":43060130021435,"sku":"NR-HEAD-RACING-390-CLONE","price":250.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head .050\"","offer_id":43060130054203,"sku":"NR-HEAD-RACING-390-CLONE","price":250.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head .065\"","offer_id":43060130086971,"sku":"NR-HEAD-RACING-390-CLONE","price":250.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head .080\"","offer_id":43060130119739,"sku":"NR-HEAD-RACING-390-CLONE","price":250.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head .100\"","offer_id":43060130152507,"sku":"NR-HEAD-RACING-390-CLONE","price":250.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Single Alum Retainers \/ Mill Head .120\" **","offer_id":43060130185275,"sku":"NR-HEAD-RACING-390-CLONE","price":250.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Dual Springs Alum Retainers [+$4] \/ Do Not Mill","offer_id":43060130218043,"sku":"NR-HEAD-RACING-390-CLONE","price":254.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Dual Springs Alum Retainers [+$4] \/ Mill Head .025\"","offer_id":43060130250811,"sku":"NR-HEAD-RACING-390-CLONE","price":254.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Dual Springs Alum Retainers [+$4] \/ Mill Head .050\"","offer_id":43060130283579,"sku":"NR-HEAD-RACING-390-CLONE","price":254.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Dual Springs Alum Retainers [+$4] \/ Mill Head .065\"","offer_id":43060130316347,"sku":"NR-HEAD-RACING-390-CLONE","price":254.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Dual Springs Alum Retainers [+$4] \/ Mill Head 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.050\"","offer_id":43060130512955,"sku":"NR-HEAD-RACING-390-CLONE","price":284.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Dual Springs Titan Retainers [+$34] \/ Mill Head .065\"","offer_id":43060130545723,"sku":"NR-HEAD-RACING-390-CLONE","price":284.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Dual Springs Titan Retainers [+$34] \/ Mill Head .080\"","offer_id":43060130578491,"sku":"NR-HEAD-RACING-390-CLONE","price":284.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Dual Springs Titan Retainers [+$34] \/ Mill Head .100\"","offer_id":43060130611259,"sku":"NR-HEAD-RACING-390-CLONE","price":284.0,"currency_code":"USD","in_stock":true},{"title":"36 Intake 32 Dual Springs Titan Retainers [+$34] \/ Mill Head .120\" **","offer_id":43060130644027,"sku":"NR-HEAD-RACING-390-CLONE","price":284.0,"currency_code":"USD","in_stock":true},{"title":"40 Intake 32 Dual Springs Alum Retainers [+$61] \/ Do Not 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.100\"","offer_id":43060130840635,"sku":"NR-HEAD-RACING-390-CLONE","price":311.0,"currency_code":"USD","in_stock":true},{"title":"40 Intake 32 Dual Springs Alum Retainers [+$61] \/ Mill Head .120\" **","offer_id":43060130873403,"sku":"NR-HEAD-RACING-390-CLONE","price":311.0,"currency_code":"USD","in_stock":true},{"title":"40 Intake 32 Dual Springs Titan Retainers [+$88] \/ Do Not Mill","offer_id":43060130906171,"sku":"NR-HEAD-RACING-390-CLONE","price":338.0,"currency_code":"USD","in_stock":true},{"title":"40 Intake 32 Dual Springs Titan Retainers [+$88] \/ Mill Head .025\"","offer_id":43060130938939,"sku":"NR-HEAD-RACING-390-CLONE","price":338.0,"currency_code":"USD","in_stock":true},{"title":"40 Intake 32 Dual Springs Titan Retainers [+$88] \/ Mill Head .050\"","offer_id":43060130971707,"sku":"NR-HEAD-RACING-390-CLONE","price":338.0,"currency_code":"USD","in_stock":true},{"title":"40 Intake 32 Dual Springs Titan Retainers [+$88] \/ Mill Head .065\"","offer_id":43060131004475,"sku":"NR-HEAD-RACING-390-CLONE","price":338.0,"currency_code":"USD","in_stock":true},{"title":"40 Intake 32 Dual Springs Titan Retainers [+$88] \/ Mill Head .080\"","offer_id":43060131037243,"sku":"NR-HEAD-RACING-390-CLONE","price":338.0,"currency_code":"USD","in_stock":true},{"title":"40 Intake 32 Dual Springs Titan Retainers [+$88] \/ Mill Head .100\"","offer_id":43060131070011,"sku":"NR-HEAD-RACING-390-CLONE","price":338.0,"currency_code":"USD","in_stock":true},{"title":"40 Intake 32 Dual Springs Titan Retainers [+$88] \/ Mill Head .120\" **","offer_id":43060131102779,"sku":"NR-HEAD-RACING-390-CLONE","price":338.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0589\/5159\/8139\/files\/HEAD-RACING-390-CLONE-2.jpg?v=1764893780","url":"https:\/\/gtcracing.com\/products\/ready-to-go-race-head-for-gx390-420cc-and-460cc","provider":"GTC Racing","version":"1.0","type":"link"}