{"product_id":"ready-to-go-420-hemi-race-head","title":"Ready-to-Go 420 Hemi Race Head","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\u003cspan\u003eHeads are ported, bead blasted, flowed, and milled. Oversize stainless valves. Heads can be fitted with either single or dual springs. Single springs recommended for 280 and smaller cams. Dual for 306 and larger cams.\u003c\/span\u003e\u003cbr\u003e\u003cbr\u003e\u003cb\u003eIncludes:\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003ePorted and bead blasted\u003c\/li\u003e\n\u003cli\u003e40mm stainless intake and 34mm 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\u003cli\u003eMilled to specs\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cb\u003e\u003cbr\u003e*Note:\u003cspan\u003e \u003c\/span\u003e\u003c\/b\u003e\u003cspan\u003eRocker arms not included. Heads are typically built to order - allow 1-5 days to ship. Due to valve size, valve face will extend beyond surface of head if head is milled.\u003c\/span\u003e\u003cbr\u003e\u003cb\u003eValve-to-piston interference can be an issue with hemi heads and must be checked. Pistons may require notching.\u003c\/b\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"GoKarts USA®","offers":[{"title":"Single Springs with Aluminum Retainers \/ Do Not Mill","offer_id":43060127727675,"sku":"NR-HEAD-RACING-420HEMI","price":285.0,"currency_code":"USD","in_stock":true},{"title":"Single Springs with Aluminum Retainers \/ Mill Head .025\"","offer_id":43060127760443,"sku":"NR-HEAD-RACING-420HEMI","price":285.0,"currency_code":"USD","in_stock":true},{"title":"Single Springs with Aluminum Retainers \/ Mill Head .040\"","offer_id":43060127793211,"sku":"NR-HEAD-RACING-420HEMI","price":285.0,"currency_code":"USD","in_stock":true},{"title":"Dual Springs with Titanium Retainers [+$32] \/ Do Not Mill","offer_id":43060127825979,"sku":"NR-HEAD-RACING-420HEMI","price":317.0,"currency_code":"USD","in_stock":true},{"title":"Dual Springs with Titanium Retainers [+$32] \/ Mill Head .025\"","offer_id":43060127858747,"sku":"NR-HEAD-RACING-420HEMI","price":317.0,"currency_code":"USD","in_stock":true},{"title":"Dual Springs with Titanium Retainers [+$32] \/ Mill Head .040\"","offer_id":43060127891515,"sku":"NR-HEAD-RACING-420HEMI","price":317.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0589\/5159\/8139\/files\/HEAD-RACING-420HEMI-2.jpg?v=1764893777","url":"https:\/\/gtcracing.com\/products\/ready-to-go-420-hemi-race-head","provider":"GTC Racing","version":"1.0","type":"link"}